Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/geom/journal/g_journal.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2005-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/kernel.h> 35 #include <sys/module.h> 36 #include <sys/limits.h> 37 #include <sys/lock.h> 38 #include <sys/mutex.h> 39 #include <sys/bio.h> 40 #include <sys/sysctl.h> 41 #include <sys/malloc.h> 42 #include <sys/mount.h> 43 #include <sys/eventhandler.h> 44 #include <sys/proc.h> 45 #include <sys/kthread.h> 46 #include <sys/sched.h> 47 #include <sys/taskqueue.h> 48 #include <sys/vnode.h> 49 #include <sys/sbuf.h> 50 #ifdef GJ_MEMDEBUG 51 #include <sys/stack.h> 52 #include <sys/kdb.h> 53 #endif 54 #include <vm/vm.h> 55 #include <vm/vm_kern.h> 56 #include <geom/geom.h> 57 #include <geom/geom_dbg.h> 58 59 #include <geom/journal/g_journal.h> 60 61 FEATURE(geom_journal, "GEOM journaling support"); 62 63 /* 64 * On-disk journal format: 65 * 66 * JH - Journal header 67 * RH - Record header 68 * 69 * %%%%%% ****** +------+ +------+ ****** +------+ %%%%%% 70 * % JH % * RH * | Data | | Data | ... * RH * | Data | ... % JH % ... 71 * %%%%%% ****** +------+ +------+ ****** +------+ %%%%%% 72 * 73 */ 74 75 CTASSERT(sizeof(struct g_journal_header) <= 512); 76 CTASSERT(sizeof(struct g_journal_record_header) <= 512); 77 78 static MALLOC_DEFINE(M_JOURNAL, "journal_data", "GEOM_JOURNAL Data"); 79 static struct mtx g_journal_cache_mtx; 80 MTX_SYSINIT(g_journal_cache, &g_journal_cache_mtx, "cache usage", MTX_DEF); 81 82 const struct g_journal_desc *g_journal_filesystems[] = { 83 &g_journal_ufs, 84 NULL 85 }; 86 87 SYSCTL_DECL(_kern_geom); 88 89 int g_journal_debug = 0; 90 static u_int g_journal_switch_time = 10; 91 static u_int g_journal_force_switch = 70; 92 static u_int g_journal_parallel_flushes = 16; 93 static u_int g_journal_parallel_copies = 16; 94 static u_int g_journal_accept_immediately = 64; 95 static u_int g_journal_record_entries = GJ_RECORD_HEADER_NENTRIES; 96 static u_int g_journal_do_optimize = 1; 97 98 static SYSCTL_NODE(_kern_geom, OID_AUTO, journal, 99 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 100 "GEOM_JOURNAL stuff"); 101 SYSCTL_INT(_kern_geom_journal, OID_AUTO, debug, CTLFLAG_RWTUN, &g_journal_debug, 0, 102 "Debug level"); 103 SYSCTL_UINT(_kern_geom_journal, OID_AUTO, switch_time, CTLFLAG_RW, 104 &g_journal_switch_time, 0, "Switch journals every N seconds"); 105 SYSCTL_UINT(_kern_geom_journal, OID_AUTO, force_switch, CTLFLAG_RW, 106 &g_journal_force_switch, 0, "Force switch when journal is N% full"); 107 SYSCTL_UINT(_kern_geom_journal, OID_AUTO, parallel_flushes, CTLFLAG_RW, 108 &g_journal_parallel_flushes, 0, 109 "Number of flush I/O requests to send in parallel"); 110 SYSCTL_UINT(_kern_geom_journal, OID_AUTO, accept_immediately, CTLFLAG_RW, 111 &g_journal_accept_immediately, 0, 112 "Number of I/O requests accepted immediately"); 113 SYSCTL_UINT(_kern_geom_journal, OID_AUTO, parallel_copies, CTLFLAG_RW, 114 &g_journal_parallel_copies, 0, 115 "Number of copy I/O requests to send in parallel"); 116 static int 117 g_journal_record_entries_sysctl(SYSCTL_HANDLER_ARGS) 118 { 119 u_int entries; 120 int error; 121 122 entries = g_journal_record_entries; 123 error = sysctl_handle_int(oidp, &entries, 0, req); 124 if (error != 0 || req->newptr == NULL) 125 return (error); 126 if (entries < 1 || entries > GJ_RECORD_HEADER_NENTRIES) 127 return (EINVAL); 128 g_journal_record_entries = entries; 129 return (0); 130 } 131 SYSCTL_PROC(_kern_geom_journal, OID_AUTO, record_entries, 132 CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, 0, 133 g_journal_record_entries_sysctl, "I", 134 "Maximum number of entires in one journal record"); 135 SYSCTL_UINT(_kern_geom_journal, OID_AUTO, optimize, CTLFLAG_RW, 136 &g_journal_do_optimize, 0, "Try to combine bios on flush and copy"); 137 138 static u_long g_journal_cache_used = 0; 139 static u_long g_journal_cache_limit = 64 * 1024 * 1024; 140 static u_int g_journal_cache_divisor = 2; 141 static u_int g_journal_cache_switch = 90; 142 static u_int g_journal_cache_misses = 0; 143 static u_int g_journal_cache_alloc_failures = 0; 144 static u_long g_journal_cache_low = 0; 145 146 static SYSCTL_NODE(_kern_geom_journal, OID_AUTO, cache, 147 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 148 "GEOM_JOURNAL cache"); 149 SYSCTL_ULONG(_kern_geom_journal_cache, OID_AUTO, used, CTLFLAG_RD, 150 &g_journal_cache_used, 0, "Number of allocated bytes"); 151 static int 152 g_journal_cache_limit_sysctl(SYSCTL_HANDLER_ARGS) 153 { 154 u_long limit; 155 int error; 156 157 limit = g_journal_cache_limit; 158 error = sysctl_handle_long(oidp, &limit, 0, req); 159 if (error != 0 || req->newptr == NULL) 160 return (error); 161 g_journal_cache_limit = limit; 162 g_journal_cache_low = (limit / 100) * g_journal_cache_switch; 163 return (0); 164 } 165 SYSCTL_PROC(_kern_geom_journal_cache, OID_AUTO, limit, 166 CTLTYPE_ULONG | CTLFLAG_RWTUN | CTLFLAG_MPSAFE, NULL, 0, 167 g_journal_cache_limit_sysctl, "I", 168 "Maximum number of allocated bytes"); 169 SYSCTL_UINT(_kern_geom_journal_cache, OID_AUTO, divisor, CTLFLAG_RDTUN, 170 &g_journal_cache_divisor, 0, 171 "(kmem_size / kern.geom.journal.cache.divisor) == cache size"); 172 static int 173 g_journal_cache_switch_sysctl(SYSCTL_HANDLER_ARGS) 174 { 175 u_int cswitch; 176 int error; 177 178 cswitch = g_journal_cache_switch; 179 error = sysctl_handle_int(oidp, &cswitch, 0, req); 180 if (error != 0 || req->newptr == NULL) 181 return (error); 182 if (cswitch > 100) 183 return (EINVAL); 184 g_journal_cache_switch = cswitch; 185 g_journal_cache_low = (g_journal_cache_limit / 100) * cswitch; 186 return (0); 187 } 188 SYSCTL_PROC(_kern_geom_journal_cache, OID_AUTO, switch, 189 CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, 0, 190 g_journal_cache_switch_sysctl, "I", 191 "Force switch when we hit this percent of cache use"); 192 SYSCTL_UINT(_kern_geom_journal_cache, OID_AUTO, misses, CTLFLAG_RW, 193 &g_journal_cache_misses, 0, "Number of cache misses"); 194 SYSCTL_UINT(_kern_geom_journal_cache, OID_AUTO, alloc_failures, CTLFLAG_RW, 195 &g_journal_cache_alloc_failures, 0, "Memory allocation failures"); 196 197 static u_long g_journal_stats_bytes_skipped = 0; 198 static u_long g_journal_stats_combined_ios = 0; 199 static u_long g_journal_stats_switches = 0; 200 static u_long g_journal_stats_wait_for_copy = 0; 201 static u_long g_journal_stats_journal_full = 0; 202 static u_long g_journal_stats_low_mem = 0; 203 204 static SYSCTL_NODE(_kern_geom_journal, OID_AUTO, stats, 205 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 206 "GEOM_JOURNAL statistics"); 207 SYSCTL_ULONG(_kern_geom_journal_stats, OID_AUTO, skipped_bytes, CTLFLAG_RW, 208 &g_journal_stats_bytes_skipped, 0, "Number of skipped bytes"); 209 SYSCTL_ULONG(_kern_geom_journal_stats, OID_AUTO, combined_ios, CTLFLAG_RW, 210 &g_journal_stats_combined_ios, 0, "Number of combined I/O requests"); 211 SYSCTL_ULONG(_kern_geom_journal_stats, OID_AUTO, switches, CTLFLAG_RW, 212 &g_journal_stats_switches, 0, "Number of journal switches"); 213 SYSCTL_ULONG(_kern_geom_journal_stats, OID_AUTO, wait_for_copy, CTLFLAG_RW, 214 &g_journal_stats_wait_for_copy, 0, "Wait for journal copy on switch"); 215 SYSCTL_ULONG(_kern_geom_journal_stats, OID_AUTO, journal_full, CTLFLAG_RW, 216 &g_journal_stats_journal_full, 0, 217 "Number of times journal was almost full."); 218 SYSCTL_ULONG(_kern_geom_journal_stats, OID_AUTO, low_mem, CTLFLAG_RW, 219 &g_journal_stats_low_mem, 0, "Number of times low_mem hook was called."); 220 221 static g_taste_t g_journal_taste; 222 static g_ctl_req_t g_journal_config; 223 static g_dumpconf_t g_journal_dumpconf; 224 static g_init_t g_journal_init; 225 static g_fini_t g_journal_fini; 226 227 struct g_class g_journal_class = { 228 .name = G_JOURNAL_CLASS_NAME, 229 .version = G_VERSION, 230 .taste = g_journal_taste, 231 .ctlreq = g_journal_config, 232 .dumpconf = g_journal_dumpconf, 233 .init = g_journal_init, 234 .fini = g_journal_fini 235 }; 236 237 static int g_journal_destroy(struct g_journal_softc *sc); 238 static void g_journal_metadata_update(struct g_journal_softc *sc); 239 static void g_journal_start_switcher(struct g_class *mp); 240 static void g_journal_stop_switcher(void); 241 static void g_journal_switch_wait(struct g_journal_softc *sc); 242 243 #define GJ_SWITCHER_WORKING 0 244 #define GJ_SWITCHER_DIE 1 245 #define GJ_SWITCHER_DIED 2 246 static struct proc *g_journal_switcher_proc = NULL; 247 static int g_journal_switcher_state = GJ_SWITCHER_WORKING; 248 static int g_journal_switcher_wokenup = 0; 249 static int g_journal_sync_requested = 0; 250 251 #ifdef GJ_MEMDEBUG 252 struct meminfo { 253 size_t mi_size; 254 struct stack mi_stack; 255 }; 256 #endif 257 258 /* 259 * We use our own malloc/realloc/free functions, so we can collect statistics 260 * and force journal switch when we're running out of cache. 261 */ 262 static void * 263 gj_malloc(size_t size, int flags) 264 { 265 void *p; 266 #ifdef GJ_MEMDEBUG 267 struct meminfo *mi; 268 #endif 269 270 mtx_lock(&g_journal_cache_mtx); 271 if (g_journal_cache_limit > 0 && !g_journal_switcher_wokenup && 272 g_journal_cache_used + size > g_journal_cache_low) { 273 GJ_DEBUG(1, "No cache, waking up the switcher."); 274 g_journal_switcher_wokenup = 1; 275 wakeup(&g_journal_switcher_state); 276 } 277 if ((flags & M_NOWAIT) && g_journal_cache_limit > 0 && 278 g_journal_cache_used + size > g_journal_cache_limit) { 279 mtx_unlock(&g_journal_cache_mtx); 280 g_journal_cache_alloc_failures++; 281 return (NULL); 282 } 283 g_journal_cache_used += size; 284 mtx_unlock(&g_journal_cache_mtx); 285 flags &= ~M_NOWAIT; 286 #ifndef GJ_MEMDEBUG 287 p = malloc(size, M_JOURNAL, flags | M_WAITOK); 288 #else 289 mi = malloc(sizeof(*mi) + size, M_JOURNAL, flags | M_WAITOK); 290 p = (u_char *)mi + sizeof(*mi); 291 mi->mi_size = size; 292 stack_save(&mi->mi_stack); 293 #endif 294 return (p); 295 } 296 297 static void 298 gj_free(void *p, size_t size) 299 { 300 #ifdef GJ_MEMDEBUG 301 struct meminfo *mi; 302 #endif 303 304 KASSERT(p != NULL, ("p=NULL")); 305 KASSERT(size > 0, ("size=0")); 306 mtx_lock(&g_journal_cache_mtx); 307 KASSERT(g_journal_cache_used >= size, ("Freeing too much?")); 308 g_journal_cache_used -= size; 309 mtx_unlock(&g_journal_cache_mtx); 310 #ifdef GJ_MEMDEBUG 311 mi = p = (void *)((u_char *)p - sizeof(*mi)); 312 if (mi->mi_size != size) { 313 printf("GJOURNAL: Size mismatch! %zu != %zu\n", size, 314 mi->mi_size); 315 printf("GJOURNAL: Alloc backtrace:\n"); 316 stack_print(&mi->mi_stack); 317 printf("GJOURNAL: Free backtrace:\n"); 318 kdb_backtrace(); 319 } 320 #endif 321 free(p, M_JOURNAL); 322 } 323 324 static void * 325 gj_realloc(void *p, size_t size, size_t oldsize) 326 { 327 void *np; 328 329 #ifndef GJ_MEMDEBUG 330 mtx_lock(&g_journal_cache_mtx); 331 g_journal_cache_used -= oldsize; 332 g_journal_cache_used += size; 333 mtx_unlock(&g_journal_cache_mtx); 334 np = realloc(p, size, M_JOURNAL, M_WAITOK); 335 #else 336 np = gj_malloc(size, M_WAITOK); 337 bcopy(p, np, MIN(oldsize, size)); 338 gj_free(p, oldsize); 339 #endif 340 return (np); 341 } 342 343 static void 344 g_journal_check_overflow(struct g_journal_softc *sc) 345 { 346 off_t length, used; 347 348 if ((sc->sc_active.jj_offset < sc->sc_inactive.jj_offset && 349 sc->sc_journal_offset >= sc->sc_inactive.jj_offset) || 350 (sc->sc_active.jj_offset > sc->sc_inactive.jj_offset && 351 sc->sc_journal_offset >= sc->sc_inactive.jj_offset && 352 sc->sc_journal_offset < sc->sc_active.jj_offset)) { 353 panic("Journal overflow " 354 "(id = %u joffset=%jd active=%jd inactive=%jd)", 355 (unsigned)sc->sc_id, 356 (intmax_t)sc->sc_journal_offset, 357 (intmax_t)sc->sc_active.jj_offset, 358 (intmax_t)sc->sc_inactive.jj_offset); 359 } 360 if (sc->sc_active.jj_offset < sc->sc_inactive.jj_offset) { 361 length = sc->sc_inactive.jj_offset - sc->sc_active.jj_offset; 362 used = sc->sc_journal_offset - sc->sc_active.jj_offset; 363 } else { 364 length = sc->sc_jend - sc->sc_active.jj_offset; 365 length += sc->sc_inactive.jj_offset - sc->sc_jstart; 366 if (sc->sc_journal_offset >= sc->sc_active.jj_offset) 367 used = sc->sc_journal_offset - sc->sc_active.jj_offset; 368 else { 369 used = sc->sc_jend - sc->sc_active.jj_offset; 370 used += sc->sc_journal_offset - sc->sc_jstart; 371 } 372 } 373 /* Already woken up? */ 374 if (g_journal_switcher_wokenup) 375 return; 376 /* 377 * If the active journal takes more than g_journal_force_switch precent 378 * of free journal space, we force journal switch. 379 */ 380 KASSERT(length > 0, 381 ("length=%jd used=%jd active=%jd inactive=%jd joffset=%jd", 382 (intmax_t)length, (intmax_t)used, 383 (intmax_t)sc->sc_active.jj_offset, 384 (intmax_t)sc->sc_inactive.jj_offset, 385 (intmax_t)sc->sc_journal_offset)); 386 if ((used * 100) / length > g_journal_force_switch) { 387 g_journal_stats_journal_full++; 388 GJ_DEBUG(1, "Journal %s %jd%% full, forcing journal switch.", 389 sc->sc_name, (used * 100) / length); 390 mtx_lock(&g_journal_cache_mtx); 391 g_journal_switcher_wokenup = 1; 392 wakeup(&g_journal_switcher_state); 393 mtx_unlock(&g_journal_cache_mtx); 394 } 395 } 396 397 static void 398 g_journal_orphan(struct g_consumer *cp) 399 { 400 struct g_journal_softc *sc; 401 char name[256]; 402 int error; 403 404 g_topology_assert(); 405 sc = cp->geom->softc; 406 strlcpy(name, cp->provider->name, sizeof(name)); 407 GJ_DEBUG(0, "Lost provider %s.", name); 408 if (sc == NULL) 409 return; 410 error = g_journal_destroy(sc); 411 if (error == 0) 412 GJ_DEBUG(0, "Journal %s destroyed.", name); 413 else { 414 GJ_DEBUG(0, "Cannot destroy journal %s (error=%d). " 415 "Destroy it manually after last close.", sc->sc_name, 416 error); 417 } 418 } 419 420 static int 421 g_journal_access(struct g_provider *pp, int acr, int acw, int ace) 422 { 423 struct g_journal_softc *sc; 424 int dcw; 425 426 g_topology_assert(); 427 GJ_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, 428 acr, acw, ace); 429 430 dcw = pp->acw + acw; 431 432 sc = pp->geom->softc; 433 if (sc == NULL || (sc->sc_flags & GJF_DEVICE_DESTROY)) { 434 if (acr <= 0 && acw <= 0 && ace <= 0) 435 return (0); 436 else 437 return (ENXIO); 438 } 439 if (pp->acw == 0 && dcw > 0) { 440 GJ_DEBUG(1, "Marking %s as dirty.", sc->sc_name); 441 sc->sc_flags &= ~GJF_DEVICE_CLEAN; 442 g_topology_unlock(); 443 g_journal_metadata_update(sc); 444 g_topology_lock(); 445 } /* else if (pp->acw == 0 && dcw > 0 && JEMPTY(sc)) { 446 GJ_DEBUG(1, "Marking %s as clean.", sc->sc_name); 447 sc->sc_flags |= GJF_DEVICE_CLEAN; 448 g_topology_unlock(); 449 g_journal_metadata_update(sc); 450 g_topology_lock(); 451 } */ 452 return (0); 453 } 454 455 static void 456 g_journal_header_encode(struct g_journal_header *hdr, u_char *data) 457 { 458 459 bcopy(GJ_HEADER_MAGIC, data, sizeof(GJ_HEADER_MAGIC)); 460 data += sizeof(GJ_HEADER_MAGIC); 461 le32enc(data, hdr->jh_journal_id); 462 data += 4; 463 le32enc(data, hdr->jh_journal_next_id); 464 } 465 466 static int 467 g_journal_header_decode(const u_char *data, struct g_journal_header *hdr) 468 { 469 470 bcopy(data, hdr->jh_magic, sizeof(hdr->jh_magic)); 471 data += sizeof(hdr->jh_magic); 472 if (bcmp(hdr->jh_magic, GJ_HEADER_MAGIC, sizeof(GJ_HEADER_MAGIC)) != 0) 473 return (EINVAL); 474 hdr->jh_journal_id = le32dec(data); 475 data += 4; 476 hdr->jh_journal_next_id = le32dec(data); 477 return (0); 478 } 479 480 static void 481 g_journal_flush_cache(struct g_journal_softc *sc) 482 { 483 struct bintime bt; 484 int error; 485 486 if (sc->sc_bio_flush == 0) 487 return; 488 GJ_TIMER_START(1, &bt); 489 if (sc->sc_bio_flush & GJ_FLUSH_JOURNAL) { 490 error = g_io_flush(sc->sc_jconsumer); 491 GJ_DEBUG(error == 0 ? 2 : 0, "Flush cache of %s: error=%d.", 492 sc->sc_jconsumer->provider->name, error); 493 } 494 if (sc->sc_bio_flush & GJ_FLUSH_DATA) { 495 /* 496 * TODO: This could be called in parallel with the 497 * previous call. 498 */ 499 error = g_io_flush(sc->sc_dconsumer); 500 GJ_DEBUG(error == 0 ? 2 : 0, "Flush cache of %s: error=%d.", 501 sc->sc_dconsumer->provider->name, error); 502 } 503 GJ_TIMER_STOP(1, &bt, "Cache flush time"); 504 } 505 506 static int 507 g_journal_write_header(struct g_journal_softc *sc) 508 { 509 struct g_journal_header hdr; 510 struct g_consumer *cp; 511 u_char *buf; 512 int error; 513 514 cp = sc->sc_jconsumer; 515 buf = gj_malloc(cp->provider->sectorsize, M_WAITOK); 516 517 strlcpy(hdr.jh_magic, GJ_HEADER_MAGIC, sizeof(hdr.jh_magic)); 518 hdr.jh_journal_id = sc->sc_journal_id; 519 hdr.jh_journal_next_id = sc->sc_journal_next_id; 520 g_journal_header_encode(&hdr, buf); 521 error = g_write_data(cp, sc->sc_journal_offset, buf, 522 cp->provider->sectorsize); 523 /* if (error == 0) */ 524 sc->sc_journal_offset += cp->provider->sectorsize; 525 526 gj_free(buf, cp->provider->sectorsize); 527 return (error); 528 } 529 530 /* 531 * Every journal record has a header and data following it. 532 * Functions below are used to decode the header before storing it to 533 * little endian and to encode it after reading to system endianness. 534 */ 535 static void 536 g_journal_record_header_encode(struct g_journal_record_header *hdr, 537 u_char *data) 538 { 539 struct g_journal_entry *ent; 540 u_int i; 541 542 bcopy(GJ_RECORD_HEADER_MAGIC, data, sizeof(GJ_RECORD_HEADER_MAGIC)); 543 data += sizeof(GJ_RECORD_HEADER_MAGIC); 544 le32enc(data, hdr->jrh_journal_id); 545 data += 8; 546 le16enc(data, hdr->jrh_nentries); 547 data += 2; 548 bcopy(hdr->jrh_sum, data, sizeof(hdr->jrh_sum)); 549 data += 8; 550 for (i = 0; i < hdr->jrh_nentries; i++) { 551 ent = &hdr->jrh_entries[i]; 552 le64enc(data, ent->je_joffset); 553 data += 8; 554 le64enc(data, ent->je_offset); 555 data += 8; 556 le64enc(data, ent->je_length); 557 data += 8; 558 } 559 } 560 561 static int 562 g_journal_record_header_decode(const u_char *data, 563 struct g_journal_record_header *hdr) 564 { 565 struct g_journal_entry *ent; 566 u_int i; 567 568 bcopy(data, hdr->jrh_magic, sizeof(hdr->jrh_magic)); 569 data += sizeof(hdr->jrh_magic); 570 if (strcmp(hdr->jrh_magic, GJ_RECORD_HEADER_MAGIC) != 0) 571 return (EINVAL); 572 hdr->jrh_journal_id = le32dec(data); 573 data += 8; 574 hdr->jrh_nentries = le16dec(data); 575 data += 2; 576 if (hdr->jrh_nentries > GJ_RECORD_HEADER_NENTRIES) 577 return (EINVAL); 578 bcopy(data, hdr->jrh_sum, sizeof(hdr->jrh_sum)); 579 data += 8; 580 for (i = 0; i < hdr->jrh_nentries; i++) { 581 ent = &hdr->jrh_entries[i]; 582 ent->je_joffset = le64dec(data); 583 data += 8; 584 ent->je_offset = le64dec(data); 585 data += 8; 586 ent->je_length = le64dec(data); 587 data += 8; 588 } 589 return (0); 590 } 591 592 /* 593 * Function reads metadata from a provider (via the given consumer), decodes 594 * it to system endianness and verifies its correctness. 595 */ 596 static int 597 g_journal_metadata_read(struct g_consumer *cp, struct g_journal_metadata *md) 598 { 599 struct g_provider *pp; 600 u_char *buf; 601 int error; 602 603 g_topology_assert(); 604 605 error = g_access(cp, 1, 0, 0); 606 if (error != 0) 607 return (error); 608 pp = cp->provider; 609 g_topology_unlock(); 610 /* Metadata is stored in last sector. */ 611 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 612 &error); 613 g_topology_lock(); 614 g_access(cp, -1, 0, 0); 615 if (buf == NULL) { 616 GJ_DEBUG(1, "Cannot read metadata from %s (error=%d).", 617 cp->provider->name, error); 618 return (error); 619 } 620 621 /* Decode metadata. */ 622 error = journal_metadata_decode(buf, md); 623 g_free(buf); 624 /* Is this is gjournal provider at all? */ 625 if (strcmp(md->md_magic, G_JOURNAL_MAGIC) != 0) 626 return (EINVAL); 627 /* 628 * Are we able to handle this version of metadata? 629 * We only maintain backward compatibility. 630 */ 631 if (md->md_version > G_JOURNAL_VERSION) { 632 GJ_DEBUG(0, 633 "Kernel module is too old to handle metadata from %s.", 634 cp->provider->name); 635 return (EINVAL); 636 } 637 /* Is checksum correct? */ 638 if (error != 0) { 639 GJ_DEBUG(0, "MD5 metadata hash mismatch for provider %s.", 640 cp->provider->name); 641 return (error); 642 } 643 return (0); 644 } 645 646 /* 647 * Two functions below are responsible for updating metadata. 648 * Only metadata on the data provider is updated (we need to update 649 * information about active journal in there). 650 */ 651 static void 652 g_journal_metadata_done(struct bio *bp) 653 { 654 655 /* 656 * There is not much we can do on error except informing about it. 657 */ 658 if (bp->bio_error != 0) { 659 GJ_LOGREQ(0, bp, "Cannot update metadata (error=%d).", 660 bp->bio_error); 661 } else { 662 GJ_LOGREQ(2, bp, "Metadata updated."); 663 } 664 gj_free(bp->bio_data, bp->bio_length); 665 g_destroy_bio(bp); 666 } 667 668 static void 669 g_journal_metadata_update(struct g_journal_softc *sc) 670 { 671 struct g_journal_metadata md; 672 struct g_consumer *cp; 673 struct bio *bp; 674 u_char *sector; 675 676 cp = sc->sc_dconsumer; 677 sector = gj_malloc(cp->provider->sectorsize, M_WAITOK); 678 strlcpy(md.md_magic, G_JOURNAL_MAGIC, sizeof(md.md_magic)); 679 md.md_version = G_JOURNAL_VERSION; 680 md.md_id = sc->sc_id; 681 md.md_type = sc->sc_orig_type; 682 md.md_jstart = sc->sc_jstart; 683 md.md_jend = sc->sc_jend; 684 md.md_joffset = sc->sc_inactive.jj_offset; 685 md.md_jid = sc->sc_journal_previous_id; 686 md.md_flags = 0; 687 if (sc->sc_flags & GJF_DEVICE_CLEAN) 688 md.md_flags |= GJ_FLAG_CLEAN; 689 690 if (sc->sc_flags & GJF_DEVICE_HARDCODED) 691 strlcpy(md.md_provider, sc->sc_name, sizeof(md.md_provider)); 692 else 693 bzero(md.md_provider, sizeof(md.md_provider)); 694 md.md_provsize = cp->provider->mediasize; 695 journal_metadata_encode(&md, sector); 696 697 /* 698 * Flush the cache, so we know all data are on disk. 699 * We write here informations like "journal is consistent", so we need 700 * to be sure it is. Without BIO_FLUSH here, we can end up in situation 701 * where metadata is stored on disk, but not all data. 702 */ 703 g_journal_flush_cache(sc); 704 705 bp = g_alloc_bio(); 706 bp->bio_offset = cp->provider->mediasize - cp->provider->sectorsize; 707 bp->bio_length = cp->provider->sectorsize; 708 bp->bio_data = sector; 709 bp->bio_cmd = BIO_WRITE; 710 if (!(sc->sc_flags & GJF_DEVICE_DESTROY)) { 711 bp->bio_done = g_journal_metadata_done; 712 g_io_request(bp, cp); 713 } else { 714 bp->bio_done = NULL; 715 g_io_request(bp, cp); 716 biowait(bp, "gjmdu"); 717 g_journal_metadata_done(bp); 718 } 719 720 /* 721 * Be sure metadata reached the disk. 722 */ 723 g_journal_flush_cache(sc); 724 } 725 726 /* 727 * This is where the I/O request comes from the GEOM. 728 */ 729 static void 730 g_journal_start(struct bio *bp) 731 { 732 struct g_journal_softc *sc; 733 734 sc = bp->bio_to->geom->softc; 735 GJ_LOGREQ(3, bp, "Request received."); 736 737 switch (bp->bio_cmd) { 738 case BIO_READ: 739 case BIO_WRITE: 740 mtx_lock(&sc->sc_mtx); 741 bioq_insert_tail(&sc->sc_regular_queue, bp); 742 wakeup(sc); 743 mtx_unlock(&sc->sc_mtx); 744 return; 745 case BIO_GETATTR: 746 if (strcmp(bp->bio_attribute, "GJOURNAL::provider") == 0) { 747 strlcpy(bp->bio_data, bp->bio_to->name, bp->bio_length); 748 bp->bio_completed = strlen(bp->bio_to->name) + 1; 749 g_io_deliver(bp, 0); 750 return; 751 } 752 /* FALLTHROUGH */ 753 case BIO_SPEEDUP: 754 case BIO_DELETE: 755 default: 756 g_io_deliver(bp, EOPNOTSUPP); 757 return; 758 } 759 } 760 761 static void 762 g_journal_std_done(struct bio *bp) 763 { 764 struct g_journal_softc *sc; 765 766 sc = bp->bio_from->geom->softc; 767 mtx_lock(&sc->sc_mtx); 768 bioq_insert_tail(&sc->sc_back_queue, bp); 769 wakeup(sc); 770 mtx_unlock(&sc->sc_mtx); 771 } 772 773 static struct bio * 774 g_journal_new_bio(off_t start, off_t end, off_t joffset, u_char *data, 775 int flags) 776 { 777 struct bio *bp; 778 779 bp = g_alloc_bio(); 780 bp->bio_offset = start; 781 bp->bio_joffset = joffset; 782 bp->bio_length = end - start; 783 bp->bio_cmd = BIO_WRITE; 784 bp->bio_done = g_journal_std_done; 785 if (data == NULL) 786 bp->bio_data = NULL; 787 else { 788 bp->bio_data = gj_malloc(bp->bio_length, flags); 789 if (bp->bio_data != NULL) 790 bcopy(data, bp->bio_data, bp->bio_length); 791 } 792 return (bp); 793 } 794 795 #define g_journal_insert_bio(head, bp, flags) \ 796 g_journal_insert((head), (bp)->bio_offset, \ 797 (bp)->bio_offset + (bp)->bio_length, (bp)->bio_joffset, \ 798 (bp)->bio_data, flags) 799 /* 800 * The function below does a lot more than just inserting bio to the queue. 801 * It keeps the queue sorted by offset and ensures that there are no doubled 802 * data (it combines bios where ranges overlap). 803 * 804 * The function returns the number of bios inserted (as bio can be splitted). 805 */ 806 static int 807 g_journal_insert(struct bio **head, off_t nstart, off_t nend, off_t joffset, 808 u_char *data, int flags) 809 { 810 struct bio *nbp, *cbp, *pbp; 811 off_t cstart, cend; 812 u_char *tmpdata; 813 int n; 814 815 GJ_DEBUG(3, "INSERT(%p): (%jd, %jd, %jd)", *head, nstart, nend, 816 joffset); 817 n = 0; 818 pbp = NULL; 819 GJQ_FOREACH(*head, cbp) { 820 cstart = cbp->bio_offset; 821 cend = cbp->bio_offset + cbp->bio_length; 822 823 if (nstart >= cend) { 824 /* 825 * +-------------+ 826 * | | 827 * | current | +-------------+ 828 * | bio | | | 829 * | | | new | 830 * +-------------+ | bio | 831 * | | 832 * +-------------+ 833 */ 834 GJ_DEBUG(3, "INSERT(%p): 1", *head); 835 } else if (nend <= cstart) { 836 /* 837 * +-------------+ 838 * | | 839 * +-------------+ | current | 840 * | | | bio | 841 * | new | | | 842 * | bio | +-------------+ 843 * | | 844 * +-------------+ 845 */ 846 nbp = g_journal_new_bio(nstart, nend, joffset, data, 847 flags); 848 if (pbp == NULL) 849 *head = nbp; 850 else 851 pbp->bio_next = nbp; 852 nbp->bio_next = cbp; 853 n++; 854 GJ_DEBUG(3, "INSERT(%p): 2 (nbp=%p pbp=%p)", *head, nbp, 855 pbp); 856 goto end; 857 } else if (nstart <= cstart && nend >= cend) { 858 /* 859 * +-------------+ +-------------+ 860 * | current bio | | current bio | 861 * +---+-------------+---+ +-------------+---+ 862 * | | | | | | | 863 * | | | | | | | 864 * | +-------------+ | +-------------+ | 865 * | new bio | | new bio | 866 * +---------------------+ +-----------------+ 867 * 868 * +-------------+ +-------------+ 869 * | current bio | | current bio | 870 * +---+-------------+ +-------------+ 871 * | | | | | 872 * | | | | | 873 * | +-------------+ +-------------+ 874 * | new bio | | new bio | 875 * +-----------------+ +-------------+ 876 */ 877 g_journal_stats_bytes_skipped += cbp->bio_length; 878 cbp->bio_offset = nstart; 879 cbp->bio_joffset = joffset; 880 cbp->bio_length = cend - nstart; 881 if (cbp->bio_data != NULL) { 882 gj_free(cbp->bio_data, cend - cstart); 883 cbp->bio_data = NULL; 884 } 885 if (data != NULL) { 886 cbp->bio_data = gj_malloc(cbp->bio_length, 887 flags); 888 if (cbp->bio_data != NULL) { 889 bcopy(data, cbp->bio_data, 890 cbp->bio_length); 891 } 892 data += cend - nstart; 893 } 894 joffset += cend - nstart; 895 nstart = cend; 896 GJ_DEBUG(3, "INSERT(%p): 3 (cbp=%p)", *head, cbp); 897 } else if (nstart > cstart && nend >= cend) { 898 /* 899 * +-----------------+ +-------------+ 900 * | current bio | | current bio | 901 * | +-------------+ | +---------+---+ 902 * | | | | | | | 903 * | | | | | | | 904 * +---+-------------+ +---+---------+ | 905 * | new bio | | new bio | 906 * +-------------+ +-------------+ 907 */ 908 g_journal_stats_bytes_skipped += cend - nstart; 909 nbp = g_journal_new_bio(nstart, cend, joffset, data, 910 flags); 911 nbp->bio_next = cbp->bio_next; 912 cbp->bio_next = nbp; 913 cbp->bio_length = nstart - cstart; 914 if (cbp->bio_data != NULL) { 915 cbp->bio_data = gj_realloc(cbp->bio_data, 916 cbp->bio_length, cend - cstart); 917 } 918 if (data != NULL) 919 data += cend - nstart; 920 joffset += cend - nstart; 921 nstart = cend; 922 n++; 923 GJ_DEBUG(3, "INSERT(%p): 4 (cbp=%p)", *head, cbp); 924 } else if (nstart > cstart && nend < cend) { 925 /* 926 * +---------------------+ 927 * | current bio | 928 * | +-------------+ | 929 * | | | | 930 * | | | | 931 * +---+-------------+---+ 932 * | new bio | 933 * +-------------+ 934 */ 935 g_journal_stats_bytes_skipped += nend - nstart; 936 nbp = g_journal_new_bio(nstart, nend, joffset, data, 937 flags); 938 nbp->bio_next = cbp->bio_next; 939 cbp->bio_next = nbp; 940 if (cbp->bio_data == NULL) 941 tmpdata = NULL; 942 else 943 tmpdata = cbp->bio_data + nend - cstart; 944 nbp = g_journal_new_bio(nend, cend, 945 cbp->bio_joffset + nend - cstart, tmpdata, flags); 946 nbp->bio_next = ((struct bio *)cbp->bio_next)->bio_next; 947 ((struct bio *)cbp->bio_next)->bio_next = nbp; 948 cbp->bio_length = nstart - cstart; 949 if (cbp->bio_data != NULL) { 950 cbp->bio_data = gj_realloc(cbp->bio_data, 951 cbp->bio_length, cend - cstart); 952 } 953 n += 2; 954 GJ_DEBUG(3, "INSERT(%p): 5 (cbp=%p)", *head, cbp); 955 goto end; 956 } else if (nstart <= cstart && nend < cend) { 957 /* 958 * +-----------------+ +-------------+ 959 * | current bio | | current bio | 960 * +-------------+ | +---+---------+ | 961 * | | | | | | | 962 * | | | | | | | 963 * +-------------+---+ | +---------+---+ 964 * | new bio | | new bio | 965 * +-------------+ +-------------+ 966 */ 967 g_journal_stats_bytes_skipped += nend - nstart; 968 nbp = g_journal_new_bio(nstart, nend, joffset, data, 969 flags); 970 if (pbp == NULL) 971 *head = nbp; 972 else 973 pbp->bio_next = nbp; 974 nbp->bio_next = cbp; 975 cbp->bio_offset = nend; 976 cbp->bio_length = cend - nend; 977 cbp->bio_joffset += nend - cstart; 978 tmpdata = cbp->bio_data; 979 if (tmpdata != NULL) { 980 cbp->bio_data = gj_malloc(cbp->bio_length, 981 flags); 982 if (cbp->bio_data != NULL) { 983 bcopy(tmpdata + nend - cstart, 984 cbp->bio_data, cbp->bio_length); 985 } 986 gj_free(tmpdata, cend - cstart); 987 } 988 n++; 989 GJ_DEBUG(3, "INSERT(%p): 6 (cbp=%p)", *head, cbp); 990 goto end; 991 } 992 if (nstart == nend) 993 goto end; 994 pbp = cbp; 995 } 996 nbp = g_journal_new_bio(nstart, nend, joffset, data, flags); 997 if (pbp == NULL) 998 *head = nbp; 999 else 1000 pbp->bio_next = nbp; 1001 nbp->bio_next = NULL; 1002 n++; 1003 GJ_DEBUG(3, "INSERT(%p): 8 (nbp=%p pbp=%p)", *head, nbp, pbp); 1004 end: 1005 if (g_journal_debug >= 3) { 1006 GJQ_FOREACH(*head, cbp) { 1007 GJ_DEBUG(3, "ELEMENT: %p (%jd, %jd, %jd, %p)", cbp, 1008 (intmax_t)cbp->bio_offset, 1009 (intmax_t)cbp->bio_length, 1010 (intmax_t)cbp->bio_joffset, cbp->bio_data); 1011 } 1012 GJ_DEBUG(3, "INSERT(%p): DONE %d", *head, n); 1013 } 1014 return (n); 1015 } 1016 1017 /* 1018 * The function combines neighbour bios trying to squeeze as much data as 1019 * possible into one bio. 1020 * 1021 * The function returns the number of bios combined (negative value). 1022 */ 1023 static int 1024 g_journal_optimize(struct bio *head) 1025 { 1026 struct bio *cbp, *pbp; 1027 int n; 1028 1029 n = 0; 1030 pbp = NULL; 1031 GJQ_FOREACH(head, cbp) { 1032 /* Skip bios which has to be read first. */ 1033 if (cbp->bio_data == NULL) { 1034 pbp = NULL; 1035 continue; 1036 } 1037 /* There is no previous bio yet. */ 1038 if (pbp == NULL) { 1039 pbp = cbp; 1040 continue; 1041 } 1042 /* Is this a neighbour bio? */ 1043 if (pbp->bio_offset + pbp->bio_length != cbp->bio_offset) { 1044 /* Be sure that bios queue is sorted. */ 1045 KASSERT(pbp->bio_offset + pbp->bio_length < cbp->bio_offset, 1046 ("poffset=%jd plength=%jd coffset=%jd", 1047 (intmax_t)pbp->bio_offset, 1048 (intmax_t)pbp->bio_length, 1049 (intmax_t)cbp->bio_offset)); 1050 pbp = cbp; 1051 continue; 1052 } 1053 /* Be sure we don't end up with too big bio. */ 1054 if (pbp->bio_length + cbp->bio_length > maxphys) { 1055 pbp = cbp; 1056 continue; 1057 } 1058 /* Ok, we can join bios. */ 1059 GJ_LOGREQ(4, pbp, "Join: "); 1060 GJ_LOGREQ(4, cbp, "and: "); 1061 pbp->bio_data = gj_realloc(pbp->bio_data, 1062 pbp->bio_length + cbp->bio_length, pbp->bio_length); 1063 bcopy(cbp->bio_data, pbp->bio_data + pbp->bio_length, 1064 cbp->bio_length); 1065 gj_free(cbp->bio_data, cbp->bio_length); 1066 pbp->bio_length += cbp->bio_length; 1067 pbp->bio_next = cbp->bio_next; 1068 g_destroy_bio(cbp); 1069 cbp = pbp; 1070 g_journal_stats_combined_ios++; 1071 n--; 1072 GJ_LOGREQ(4, pbp, "Got: "); 1073 } 1074 return (n); 1075 } 1076 1077 /* 1078 * TODO: Update comment. 1079 * These are functions responsible for copying one portion of data from journal 1080 * to the destination provider. 1081 * The order goes like this: 1082 * 1. Read the header, which contains informations about data blocks 1083 * following it. 1084 * 2. Read the data blocks from the journal. 1085 * 3. Write the data blocks on the data provider. 1086 * 1087 * g_journal_copy_start() 1088 * g_journal_copy_done() - got finished write request, logs potential errors. 1089 */ 1090 1091 /* 1092 * When there is no data in cache, this function is used to read it. 1093 */ 1094 static void 1095 g_journal_read_first(struct g_journal_softc *sc, struct bio *bp) 1096 { 1097 struct bio *cbp; 1098 1099 /* 1100 * We were short in memory, so data was freed. 1101 * In that case we need to read it back from journal. 1102 */ 1103 cbp = g_alloc_bio(); 1104 cbp->bio_cflags = bp->bio_cflags; 1105 cbp->bio_parent = bp; 1106 cbp->bio_offset = bp->bio_joffset; 1107 cbp->bio_length = bp->bio_length; 1108 cbp->bio_data = gj_malloc(bp->bio_length, M_WAITOK); 1109 cbp->bio_cmd = BIO_READ; 1110 cbp->bio_done = g_journal_std_done; 1111 GJ_LOGREQ(4, cbp, "READ FIRST"); 1112 g_io_request(cbp, sc->sc_jconsumer); 1113 g_journal_cache_misses++; 1114 } 1115 1116 static void 1117 g_journal_copy_send(struct g_journal_softc *sc) 1118 { 1119 struct bio *bioq, *bp, *lbp; 1120 1121 bioq = lbp = NULL; 1122 mtx_lock(&sc->sc_mtx); 1123 for (; sc->sc_copy_in_progress < g_journal_parallel_copies;) { 1124 bp = GJQ_FIRST(sc->sc_inactive.jj_queue); 1125 if (bp == NULL) 1126 break; 1127 GJQ_REMOVE(sc->sc_inactive.jj_queue, bp); 1128 sc->sc_copy_in_progress++; 1129 GJQ_INSERT_AFTER(bioq, bp, lbp); 1130 lbp = bp; 1131 } 1132 mtx_unlock(&sc->sc_mtx); 1133 if (g_journal_do_optimize) 1134 sc->sc_copy_in_progress += g_journal_optimize(bioq); 1135 while ((bp = GJQ_FIRST(bioq)) != NULL) { 1136 GJQ_REMOVE(bioq, bp); 1137 GJQ_INSERT_HEAD(sc->sc_copy_queue, bp); 1138 bp->bio_cflags = GJ_BIO_COPY; 1139 if (bp->bio_data == NULL) 1140 g_journal_read_first(sc, bp); 1141 else { 1142 bp->bio_joffset = 0; 1143 GJ_LOGREQ(4, bp, "SEND"); 1144 g_io_request(bp, sc->sc_dconsumer); 1145 } 1146 } 1147 } 1148 1149 static void 1150 g_journal_copy_start(struct g_journal_softc *sc) 1151 { 1152 1153 /* 1154 * Remember in metadata that we're starting to copy journaled data 1155 * to the data provider. 1156 * In case of power failure, we will copy these data once again on boot. 1157 */ 1158 if (!sc->sc_journal_copying) { 1159 sc->sc_journal_copying = 1; 1160 GJ_DEBUG(1, "Starting copy of journal."); 1161 g_journal_metadata_update(sc); 1162 } 1163 g_journal_copy_send(sc); 1164 } 1165 1166 /* 1167 * Data block has been read from the journal provider. 1168 */ 1169 static int 1170 g_journal_copy_read_done(struct bio *bp) 1171 { 1172 struct g_journal_softc *sc; 1173 struct g_consumer *cp; 1174 struct bio *pbp; 1175 1176 KASSERT(bp->bio_cflags == GJ_BIO_COPY, 1177 ("Invalid bio (%d != %d).", bp->bio_cflags, GJ_BIO_COPY)); 1178 1179 sc = bp->bio_from->geom->softc; 1180 pbp = bp->bio_parent; 1181 1182 if (bp->bio_error != 0) { 1183 GJ_DEBUG(0, "Error while reading data from %s (error=%d).", 1184 bp->bio_to->name, bp->bio_error); 1185 /* 1186 * We will not be able to deliver WRITE request as well. 1187 */ 1188 gj_free(bp->bio_data, bp->bio_length); 1189 g_destroy_bio(pbp); 1190 g_destroy_bio(bp); 1191 sc->sc_copy_in_progress--; 1192 return (1); 1193 } 1194 pbp->bio_data = bp->bio_data; 1195 cp = sc->sc_dconsumer; 1196 g_io_request(pbp, cp); 1197 GJ_LOGREQ(4, bp, "READ DONE"); 1198 g_destroy_bio(bp); 1199 return (0); 1200 } 1201 1202 /* 1203 * Data block has been written to the data provider. 1204 */ 1205 static void 1206 g_journal_copy_write_done(struct bio *bp) 1207 { 1208 struct g_journal_softc *sc; 1209 1210 KASSERT(bp->bio_cflags == GJ_BIO_COPY, 1211 ("Invalid bio (%d != %d).", bp->bio_cflags, GJ_BIO_COPY)); 1212 1213 sc = bp->bio_from->geom->softc; 1214 sc->sc_copy_in_progress--; 1215 1216 if (bp->bio_error != 0) { 1217 GJ_LOGREQ(0, bp, "[copy] Error while writing data (error=%d)", 1218 bp->bio_error); 1219 } 1220 GJQ_REMOVE(sc->sc_copy_queue, bp); 1221 gj_free(bp->bio_data, bp->bio_length); 1222 GJ_LOGREQ(4, bp, "DONE"); 1223 g_destroy_bio(bp); 1224 1225 if (sc->sc_copy_in_progress == 0) { 1226 /* 1227 * This was the last write request for this journal. 1228 */ 1229 GJ_DEBUG(1, "Data has been copied."); 1230 sc->sc_journal_copying = 0; 1231 } 1232 } 1233 1234 static void g_journal_flush_done(struct bio *bp); 1235 1236 /* 1237 * Flush one record onto active journal provider. 1238 */ 1239 static void 1240 g_journal_flush(struct g_journal_softc *sc) 1241 { 1242 struct g_journal_record_header hdr; 1243 struct g_journal_entry *ent; 1244 struct g_provider *pp; 1245 struct bio **bioq; 1246 struct bio *bp, *fbp, *pbp; 1247 off_t joffset; 1248 u_char *data, hash[16]; 1249 MD5_CTX ctx; 1250 u_int i; 1251 1252 if (sc->sc_current_count == 0) 1253 return; 1254 1255 pp = sc->sc_jprovider; 1256 GJ_VALIDATE_OFFSET(sc->sc_journal_offset, sc); 1257 joffset = sc->sc_journal_offset; 1258 1259 GJ_DEBUG(2, "Storing %d journal entries on %s at %jd.", 1260 sc->sc_current_count, pp->name, (intmax_t)joffset); 1261 1262 /* 1263 * Store 'journal id', so we know to which journal this record belongs. 1264 */ 1265 hdr.jrh_journal_id = sc->sc_journal_id; 1266 /* Could be less than g_journal_record_entries if called due timeout. */ 1267 hdr.jrh_nentries = MIN(sc->sc_current_count, g_journal_record_entries); 1268 strlcpy(hdr.jrh_magic, GJ_RECORD_HEADER_MAGIC, sizeof(hdr.jrh_magic)); 1269 1270 bioq = &sc->sc_active.jj_queue; 1271 GJQ_LAST(sc->sc_flush_queue, pbp); 1272 1273 fbp = g_alloc_bio(); 1274 fbp->bio_parent = NULL; 1275 fbp->bio_cflags = GJ_BIO_JOURNAL; 1276 fbp->bio_offset = -1; 1277 fbp->bio_joffset = joffset; 1278 fbp->bio_length = pp->sectorsize; 1279 fbp->bio_cmd = BIO_WRITE; 1280 fbp->bio_done = g_journal_std_done; 1281 GJQ_INSERT_AFTER(sc->sc_flush_queue, fbp, pbp); 1282 pbp = fbp; 1283 fbp->bio_to = pp; 1284 GJ_LOGREQ(4, fbp, "FLUSH_OUT"); 1285 joffset += pp->sectorsize; 1286 sc->sc_flush_count++; 1287 if (sc->sc_flags & GJF_DEVICE_CHECKSUM) 1288 MD5Init(&ctx); 1289 1290 for (i = 0; i < hdr.jrh_nentries; i++) { 1291 bp = sc->sc_current_queue; 1292 KASSERT(bp != NULL, ("NULL bp")); 1293 bp->bio_to = pp; 1294 GJ_LOGREQ(4, bp, "FLUSHED"); 1295 sc->sc_current_queue = bp->bio_next; 1296 bp->bio_next = NULL; 1297 sc->sc_current_count--; 1298 1299 /* Add to the header. */ 1300 ent = &hdr.jrh_entries[i]; 1301 ent->je_offset = bp->bio_offset; 1302 ent->je_joffset = joffset; 1303 ent->je_length = bp->bio_length; 1304 1305 data = bp->bio_data; 1306 if (sc->sc_flags & GJF_DEVICE_CHECKSUM) 1307 MD5Update(&ctx, data, ent->je_length); 1308 g_reset_bio(bp); 1309 bp->bio_cflags = GJ_BIO_JOURNAL; 1310 bp->bio_offset = ent->je_offset; 1311 bp->bio_joffset = ent->je_joffset; 1312 bp->bio_length = ent->je_length; 1313 bp->bio_data = data; 1314 bp->bio_cmd = BIO_WRITE; 1315 bp->bio_done = g_journal_std_done; 1316 GJQ_INSERT_AFTER(sc->sc_flush_queue, bp, pbp); 1317 pbp = bp; 1318 bp->bio_to = pp; 1319 GJ_LOGREQ(4, bp, "FLUSH_OUT"); 1320 joffset += bp->bio_length; 1321 sc->sc_flush_count++; 1322 1323 /* 1324 * Add request to the active sc_journal_queue queue. 1325 * This is our cache. After journal switch we don't have to 1326 * read the data from the inactive journal, because we keep 1327 * it in memory. 1328 */ 1329 g_journal_insert(bioq, ent->je_offset, 1330 ent->je_offset + ent->je_length, ent->je_joffset, data, 1331 M_NOWAIT); 1332 } 1333 1334 /* 1335 * After all requests, store valid header. 1336 */ 1337 data = gj_malloc(pp->sectorsize, M_WAITOK); 1338 if (sc->sc_flags & GJF_DEVICE_CHECKSUM) { 1339 MD5Final(hash, &ctx); 1340 bcopy(hash, hdr.jrh_sum, sizeof(hdr.jrh_sum)); 1341 } 1342 g_journal_record_header_encode(&hdr, data); 1343 fbp->bio_data = data; 1344 1345 sc->sc_journal_offset = joffset; 1346 1347 g_journal_check_overflow(sc); 1348 } 1349 1350 /* 1351 * Flush request finished. 1352 */ 1353 static void 1354 g_journal_flush_done(struct bio *bp) 1355 { 1356 struct g_journal_softc *sc; 1357 struct g_consumer *cp; 1358 1359 KASSERT((bp->bio_cflags & GJ_BIO_MASK) == GJ_BIO_JOURNAL, 1360 ("Invalid bio (%d != %d).", bp->bio_cflags, GJ_BIO_JOURNAL)); 1361 1362 cp = bp->bio_from; 1363 sc = cp->geom->softc; 1364 sc->sc_flush_in_progress--; 1365 1366 if (bp->bio_error != 0) { 1367 GJ_LOGREQ(0, bp, "[flush] Error while writing data (error=%d)", 1368 bp->bio_error); 1369 } 1370 gj_free(bp->bio_data, bp->bio_length); 1371 GJ_LOGREQ(4, bp, "DONE"); 1372 g_destroy_bio(bp); 1373 } 1374 1375 static void g_journal_release_delayed(struct g_journal_softc *sc); 1376 1377 static void 1378 g_journal_flush_send(struct g_journal_softc *sc) 1379 { 1380 struct g_consumer *cp; 1381 struct bio *bioq, *bp, *lbp; 1382 1383 cp = sc->sc_jconsumer; 1384 bioq = lbp = NULL; 1385 while (sc->sc_flush_in_progress < g_journal_parallel_flushes) { 1386 /* Send one flush requests to the active journal. */ 1387 bp = GJQ_FIRST(sc->sc_flush_queue); 1388 if (bp != NULL) { 1389 GJQ_REMOVE(sc->sc_flush_queue, bp); 1390 sc->sc_flush_count--; 1391 bp->bio_offset = bp->bio_joffset; 1392 bp->bio_joffset = 0; 1393 sc->sc_flush_in_progress++; 1394 GJQ_INSERT_AFTER(bioq, bp, lbp); 1395 lbp = bp; 1396 } 1397 /* Try to release delayed requests. */ 1398 g_journal_release_delayed(sc); 1399 /* If there are no requests to flush, leave. */ 1400 if (GJQ_FIRST(sc->sc_flush_queue) == NULL) 1401 break; 1402 } 1403 if (g_journal_do_optimize) 1404 sc->sc_flush_in_progress += g_journal_optimize(bioq); 1405 while ((bp = GJQ_FIRST(bioq)) != NULL) { 1406 GJQ_REMOVE(bioq, bp); 1407 GJ_LOGREQ(3, bp, "Flush request send"); 1408 g_io_request(bp, cp); 1409 } 1410 } 1411 1412 static void 1413 g_journal_add_current(struct g_journal_softc *sc, struct bio *bp) 1414 { 1415 int n; 1416 1417 GJ_LOGREQ(4, bp, "CURRENT %d", sc->sc_current_count); 1418 n = g_journal_insert_bio(&sc->sc_current_queue, bp, M_WAITOK); 1419 sc->sc_current_count += n; 1420 n = g_journal_optimize(sc->sc_current_queue); 1421 sc->sc_current_count += n; 1422 /* 1423 * For requests which are added to the current queue we deliver 1424 * response immediately. 1425 */ 1426 bp->bio_completed = bp->bio_length; 1427 g_io_deliver(bp, 0); 1428 if (sc->sc_current_count >= g_journal_record_entries) { 1429 /* 1430 * Let's flush one record onto active journal provider. 1431 */ 1432 g_journal_flush(sc); 1433 } 1434 } 1435 1436 static void 1437 g_journal_release_delayed(struct g_journal_softc *sc) 1438 { 1439 struct bio *bp; 1440 1441 for (;;) { 1442 /* The flush queue is full, exit. */ 1443 if (sc->sc_flush_count >= g_journal_accept_immediately) 1444 return; 1445 bp = bioq_takefirst(&sc->sc_delayed_queue); 1446 if (bp == NULL) 1447 return; 1448 sc->sc_delayed_count--; 1449 g_journal_add_current(sc, bp); 1450 } 1451 } 1452 1453 /* 1454 * Add I/O request to the current queue. If we have enough requests for one 1455 * journal record we flush them onto active journal provider. 1456 */ 1457 static void 1458 g_journal_add_request(struct g_journal_softc *sc, struct bio *bp) 1459 { 1460 1461 /* 1462 * The flush queue is full, we need to delay the request. 1463 */ 1464 if (sc->sc_delayed_count > 0 || 1465 sc->sc_flush_count >= g_journal_accept_immediately) { 1466 GJ_LOGREQ(4, bp, "DELAYED"); 1467 bioq_insert_tail(&sc->sc_delayed_queue, bp); 1468 sc->sc_delayed_count++; 1469 return; 1470 } 1471 1472 KASSERT(TAILQ_EMPTY(&sc->sc_delayed_queue.queue), 1473 ("DELAYED queue not empty.")); 1474 g_journal_add_current(sc, bp); 1475 } 1476 1477 static void g_journal_read_done(struct bio *bp); 1478 1479 /* 1480 * Try to find requested data in cache. 1481 */ 1482 static struct bio * 1483 g_journal_read_find(struct bio *head, int sorted, struct bio *pbp, off_t ostart, 1484 off_t oend) 1485 { 1486 off_t cstart, cend; 1487 struct bio *bp; 1488 1489 GJQ_FOREACH(head, bp) { 1490 if (bp->bio_offset == -1) 1491 continue; 1492 cstart = MAX(ostart, bp->bio_offset); 1493 cend = MIN(oend, bp->bio_offset + bp->bio_length); 1494 if (cend <= ostart) 1495 continue; 1496 else if (cstart >= oend) { 1497 if (!sorted) 1498 continue; 1499 else { 1500 bp = NULL; 1501 break; 1502 } 1503 } 1504 if (bp->bio_data == NULL) 1505 break; 1506 GJ_DEBUG(3, "READ(%p): (%jd, %jd) (bp=%p)", head, cstart, cend, 1507 bp); 1508 bcopy(bp->bio_data + cstart - bp->bio_offset, 1509 pbp->bio_data + cstart - pbp->bio_offset, cend - cstart); 1510 pbp->bio_completed += cend - cstart; 1511 if (pbp->bio_completed == pbp->bio_length) { 1512 /* 1513 * Cool, the whole request was in cache, deliver happy 1514 * message. 1515 */ 1516 g_io_deliver(pbp, 0); 1517 return (pbp); 1518 } 1519 break; 1520 } 1521 return (bp); 1522 } 1523 1524 /* 1525 * This function is used for collecting data on read. 1526 * The complexity is because parts of the data can be stored in four different 1527 * places: 1528 * - in memory - the data not yet send to the active journal provider 1529 * - in the active journal 1530 * - in the inactive journal 1531 * - in the data provider 1532 */ 1533 static void 1534 g_journal_read(struct g_journal_softc *sc, struct bio *pbp, off_t ostart, 1535 off_t oend) 1536 { 1537 struct bio *bp, *nbp, *head; 1538 off_t cstart, cend; 1539 u_int i, sorted = 0; 1540 1541 GJ_DEBUG(3, "READ: (%jd, %jd)", ostart, oend); 1542 1543 cstart = cend = -1; 1544 bp = NULL; 1545 head = NULL; 1546 for (i = 1; i <= 5; i++) { 1547 switch (i) { 1548 case 1: /* Not-yet-send data. */ 1549 head = sc->sc_current_queue; 1550 sorted = 1; 1551 break; 1552 case 2: /* Skip flush queue as they are also in active queue */ 1553 continue; 1554 case 3: /* Active journal. */ 1555 head = sc->sc_active.jj_queue; 1556 sorted = 1; 1557 break; 1558 case 4: /* Inactive journal. */ 1559 /* 1560 * XXX: Here could be a race with g_journal_lowmem(). 1561 */ 1562 head = sc->sc_inactive.jj_queue; 1563 sorted = 1; 1564 break; 1565 case 5: /* In-flight to the data provider. */ 1566 head = sc->sc_copy_queue; 1567 sorted = 0; 1568 break; 1569 default: 1570 panic("gjournal %s: i=%d", __func__, i); 1571 } 1572 bp = g_journal_read_find(head, sorted, pbp, ostart, oend); 1573 if (bp == pbp) { /* Got the whole request. */ 1574 GJ_DEBUG(2, "Got the whole request from %u.", i); 1575 return; 1576 } else if (bp != NULL) { 1577 cstart = MAX(ostart, bp->bio_offset); 1578 cend = MIN(oend, bp->bio_offset + bp->bio_length); 1579 GJ_DEBUG(2, "Got part of the request from %u (%jd-%jd).", 1580 i, (intmax_t)cstart, (intmax_t)cend); 1581 break; 1582 } 1583 } 1584 if (bp != NULL) { 1585 if (bp->bio_data == NULL) { 1586 nbp = g_duplicate_bio(pbp); 1587 nbp->bio_cflags = GJ_BIO_READ; 1588 nbp->bio_data = 1589 pbp->bio_data + cstart - pbp->bio_offset; 1590 nbp->bio_offset = 1591 bp->bio_joffset + cstart - bp->bio_offset; 1592 nbp->bio_length = cend - cstart; 1593 nbp->bio_done = g_journal_read_done; 1594 g_io_request(nbp, sc->sc_jconsumer); 1595 } 1596 /* 1597 * If we don't have the whole request yet, call g_journal_read() 1598 * recursively. 1599 */ 1600 if (ostart < cstart) 1601 g_journal_read(sc, pbp, ostart, cstart); 1602 if (oend > cend) 1603 g_journal_read(sc, pbp, cend, oend); 1604 } else { 1605 /* 1606 * No data in memory, no data in journal. 1607 * Its time for asking data provider. 1608 */ 1609 GJ_DEBUG(3, "READ(data): (%jd, %jd)", ostart, oend); 1610 nbp = g_duplicate_bio(pbp); 1611 nbp->bio_cflags = GJ_BIO_READ; 1612 nbp->bio_data = pbp->bio_data + ostart - pbp->bio_offset; 1613 nbp->bio_offset = ostart; 1614 nbp->bio_length = oend - ostart; 1615 nbp->bio_done = g_journal_read_done; 1616 g_io_request(nbp, sc->sc_dconsumer); 1617 /* We have the whole request, return here. */ 1618 return; 1619 } 1620 } 1621 1622 /* 1623 * Function responsible for handling finished READ requests. 1624 * Actually, g_std_done() could be used here, the only difference is that we 1625 * log error. 1626 */ 1627 static void 1628 g_journal_read_done(struct bio *bp) 1629 { 1630 struct bio *pbp; 1631 1632 KASSERT(bp->bio_cflags == GJ_BIO_READ, 1633 ("Invalid bio (%d != %d).", bp->bio_cflags, GJ_BIO_READ)); 1634 1635 pbp = bp->bio_parent; 1636 pbp->bio_inbed++; 1637 pbp->bio_completed += bp->bio_length; 1638 1639 if (bp->bio_error != 0) { 1640 if (pbp->bio_error == 0) 1641 pbp->bio_error = bp->bio_error; 1642 GJ_DEBUG(0, "Error while reading data from %s (error=%d).", 1643 bp->bio_to->name, bp->bio_error); 1644 } 1645 g_destroy_bio(bp); 1646 if (pbp->bio_children == pbp->bio_inbed && 1647 pbp->bio_completed == pbp->bio_length) { 1648 /* We're done. */ 1649 g_io_deliver(pbp, 0); 1650 } 1651 } 1652 1653 /* 1654 * Deactive current journal and active next one. 1655 */ 1656 static void 1657 g_journal_switch(struct g_journal_softc *sc) 1658 { 1659 struct g_provider *pp; 1660 1661 if (JEMPTY(sc)) { 1662 GJ_DEBUG(3, "No need for %s switch.", sc->sc_name); 1663 pp = LIST_FIRST(&sc->sc_geom->provider); 1664 if (!(sc->sc_flags & GJF_DEVICE_CLEAN) && pp->acw == 0) { 1665 sc->sc_flags |= GJF_DEVICE_CLEAN; 1666 GJ_DEBUG(1, "Marking %s as clean.", sc->sc_name); 1667 g_journal_metadata_update(sc); 1668 } 1669 } else { 1670 GJ_DEBUG(3, "Switching journal %s.", sc->sc_geom->name); 1671 1672 pp = sc->sc_jprovider; 1673 1674 sc->sc_journal_previous_id = sc->sc_journal_id; 1675 1676 sc->sc_journal_id = sc->sc_journal_next_id; 1677 sc->sc_journal_next_id = arc4random(); 1678 1679 GJ_VALIDATE_OFFSET(sc->sc_journal_offset, sc); 1680 1681 g_journal_write_header(sc); 1682 1683 sc->sc_inactive.jj_offset = sc->sc_active.jj_offset; 1684 sc->sc_inactive.jj_queue = sc->sc_active.jj_queue; 1685 1686 sc->sc_active.jj_offset = 1687 sc->sc_journal_offset - pp->sectorsize; 1688 sc->sc_active.jj_queue = NULL; 1689 1690 /* 1691 * Switch is done, start copying data from the (now) inactive 1692 * journal to the data provider. 1693 */ 1694 g_journal_copy_start(sc); 1695 } 1696 mtx_lock(&sc->sc_mtx); 1697 sc->sc_flags &= ~GJF_DEVICE_SWITCH; 1698 mtx_unlock(&sc->sc_mtx); 1699 } 1700 1701 static void 1702 g_journal_initialize(struct g_journal_softc *sc) 1703 { 1704 1705 sc->sc_journal_id = arc4random(); 1706 sc->sc_journal_next_id = arc4random(); 1707 sc->sc_journal_previous_id = sc->sc_journal_id; 1708 sc->sc_journal_offset = sc->sc_jstart; 1709 sc->sc_inactive.jj_offset = sc->sc_jstart; 1710 g_journal_write_header(sc); 1711 sc->sc_active.jj_offset = sc->sc_jstart; 1712 } 1713 1714 static void 1715 g_journal_mark_as_dirty(struct g_journal_softc *sc) 1716 { 1717 const struct g_journal_desc *desc; 1718 int i; 1719 1720 GJ_DEBUG(1, "Marking file system %s as dirty.", sc->sc_name); 1721 for (i = 0; (desc = g_journal_filesystems[i]) != NULL; i++) 1722 desc->jd_dirty(sc->sc_dconsumer); 1723 } 1724 1725 /* 1726 * Function read record header from the given journal. 1727 * It is very simlar to g_read_data(9), but it doesn't allocate memory for bio 1728 * and data on every call. 1729 */ 1730 static int 1731 g_journal_sync_read(struct g_consumer *cp, struct bio *bp, off_t offset, 1732 void *data) 1733 { 1734 int error; 1735 1736 g_reset_bio(bp); 1737 bp->bio_cmd = BIO_READ; 1738 bp->bio_done = NULL; 1739 bp->bio_offset = offset; 1740 bp->bio_length = cp->provider->sectorsize; 1741 bp->bio_data = data; 1742 g_io_request(bp, cp); 1743 error = biowait(bp, "gjs_read"); 1744 return (error); 1745 } 1746 1747 #if 0 1748 /* 1749 * Function is called when we start the journal device and we detect that 1750 * one of the journals was not fully copied. 1751 * The purpose of this function is to read all records headers from journal 1752 * and placed them in the inactive queue, so we can start journal 1753 * synchronization process and the journal provider itself. 1754 * Design decision was taken to not synchronize the whole journal here as it 1755 * can take too much time. Reading headers only and delaying synchronization 1756 * process until after journal provider is started should be the best choice. 1757 */ 1758 #endif 1759 1760 static void 1761 g_journal_sync(struct g_journal_softc *sc) 1762 { 1763 struct g_journal_record_header rhdr; 1764 struct g_journal_entry *ent; 1765 struct g_journal_header jhdr; 1766 struct g_consumer *cp; 1767 struct bio *bp, *fbp, *tbp; 1768 off_t joffset, offset; 1769 u_char *buf, sum[16]; 1770 uint64_t id; 1771 MD5_CTX ctx; 1772 int error, found, i; 1773 1774 found = 0; 1775 fbp = NULL; 1776 cp = sc->sc_jconsumer; 1777 bp = g_alloc_bio(); 1778 buf = gj_malloc(cp->provider->sectorsize, M_WAITOK); 1779 offset = joffset = sc->sc_inactive.jj_offset = sc->sc_journal_offset; 1780 1781 GJ_DEBUG(2, "Looking for termination at %jd.", (intmax_t)joffset); 1782 1783 /* 1784 * Read and decode first journal header. 1785 */ 1786 error = g_journal_sync_read(cp, bp, offset, buf); 1787 if (error != 0) { 1788 GJ_DEBUG(0, "Error while reading journal header from %s.", 1789 cp->provider->name); 1790 goto end; 1791 } 1792 error = g_journal_header_decode(buf, &jhdr); 1793 if (error != 0) { 1794 GJ_DEBUG(0, "Cannot decode journal header from %s.", 1795 cp->provider->name); 1796 goto end; 1797 } 1798 id = sc->sc_journal_id; 1799 if (jhdr.jh_journal_id != sc->sc_journal_id) { 1800 GJ_DEBUG(1, "Journal ID mismatch at %jd (0x%08x != 0x%08x).", 1801 (intmax_t)offset, (u_int)jhdr.jh_journal_id, (u_int)id); 1802 goto end; 1803 } 1804 offset += cp->provider->sectorsize; 1805 id = sc->sc_journal_next_id = jhdr.jh_journal_next_id; 1806 1807 for (;;) { 1808 /* 1809 * If the biggest record won't fit, look for a record header or 1810 * journal header from the beginning. 1811 */ 1812 GJ_VALIDATE_OFFSET(offset, sc); 1813 error = g_journal_sync_read(cp, bp, offset, buf); 1814 if (error != 0) { 1815 /* 1816 * Not good. Having an error while reading header 1817 * means, that we cannot read next headers and in 1818 * consequence we cannot find termination. 1819 */ 1820 GJ_DEBUG(0, 1821 "Error while reading record header from %s.", 1822 cp->provider->name); 1823 break; 1824 } 1825 1826 error = g_journal_record_header_decode(buf, &rhdr); 1827 if (error != 0) { 1828 GJ_DEBUG(2, "Not a record header at %jd (error=%d).", 1829 (intmax_t)offset, error); 1830 /* 1831 * This is not a record header. 1832 * If we are lucky, this is next journal header. 1833 */ 1834 error = g_journal_header_decode(buf, &jhdr); 1835 if (error != 0) { 1836 GJ_DEBUG(1, "Not a journal header at %jd (error=%d).", 1837 (intmax_t)offset, error); 1838 /* 1839 * Nope, this is not journal header, which 1840 * bascially means that journal is not 1841 * terminated properly. 1842 */ 1843 error = ENOENT; 1844 break; 1845 } 1846 /* 1847 * Ok. This is header of _some_ journal. Now we need to 1848 * verify if this is header of the _next_ journal. 1849 */ 1850 if (jhdr.jh_journal_id != id) { 1851 GJ_DEBUG(1, "Journal ID mismatch at %jd " 1852 "(0x%08x != 0x%08x).", (intmax_t)offset, 1853 (u_int)jhdr.jh_journal_id, (u_int)id); 1854 error = ENOENT; 1855 break; 1856 } 1857 1858 /* Found termination. */ 1859 found++; 1860 GJ_DEBUG(1, "Found termination at %jd (id=0x%08x).", 1861 (intmax_t)offset, (u_int)id); 1862 sc->sc_active.jj_offset = offset; 1863 sc->sc_journal_offset = 1864 offset + cp->provider->sectorsize; 1865 sc->sc_journal_id = id; 1866 id = sc->sc_journal_next_id = jhdr.jh_journal_next_id; 1867 1868 while ((tbp = fbp) != NULL) { 1869 fbp = tbp->bio_next; 1870 GJ_LOGREQ(3, tbp, "Adding request."); 1871 g_journal_insert_bio(&sc->sc_inactive.jj_queue, 1872 tbp, M_WAITOK); 1873 } 1874 1875 /* Skip journal's header. */ 1876 offset += cp->provider->sectorsize; 1877 continue; 1878 } 1879 1880 /* Skip record's header. */ 1881 offset += cp->provider->sectorsize; 1882 1883 /* 1884 * Add information about every record entry to the inactive 1885 * queue. 1886 */ 1887 if (sc->sc_flags & GJF_DEVICE_CHECKSUM) 1888 MD5Init(&ctx); 1889 for (i = 0; i < rhdr.jrh_nentries; i++) { 1890 ent = &rhdr.jrh_entries[i]; 1891 GJ_DEBUG(3, "Insert entry: %jd %jd.", 1892 (intmax_t)ent->je_offset, (intmax_t)ent->je_length); 1893 g_journal_insert(&fbp, ent->je_offset, 1894 ent->je_offset + ent->je_length, ent->je_joffset, 1895 NULL, M_WAITOK); 1896 if (sc->sc_flags & GJF_DEVICE_CHECKSUM) { 1897 u_char *buf2; 1898 1899 /* 1900 * TODO: Should use faster function (like 1901 * g_journal_sync_read()). 1902 */ 1903 buf2 = g_read_data(cp, offset, ent->je_length, 1904 NULL); 1905 if (buf2 == NULL) 1906 GJ_DEBUG(0, "Cannot read data at %jd.", 1907 (intmax_t)offset); 1908 else { 1909 MD5Update(&ctx, buf2, ent->je_length); 1910 g_free(buf2); 1911 } 1912 } 1913 /* Skip entry's data. */ 1914 offset += ent->je_length; 1915 } 1916 if (sc->sc_flags & GJF_DEVICE_CHECKSUM) { 1917 MD5Final(sum, &ctx); 1918 if (bcmp(sum, rhdr.jrh_sum, sizeof(rhdr.jrh_sum)) != 0) { 1919 GJ_DEBUG(0, "MD5 hash mismatch at %jd!", 1920 (intmax_t)offset); 1921 } 1922 } 1923 } 1924 end: 1925 gj_free(bp->bio_data, cp->provider->sectorsize); 1926 g_destroy_bio(bp); 1927 1928 /* Remove bios from unterminated journal. */ 1929 while ((tbp = fbp) != NULL) { 1930 fbp = tbp->bio_next; 1931 g_destroy_bio(tbp); 1932 } 1933 1934 if (found < 1 && joffset > 0) { 1935 GJ_DEBUG(0, "Journal on %s is broken/corrupted. Initializing.", 1936 sc->sc_name); 1937 while ((tbp = sc->sc_inactive.jj_queue) != NULL) { 1938 sc->sc_inactive.jj_queue = tbp->bio_next; 1939 g_destroy_bio(tbp); 1940 } 1941 g_journal_initialize(sc); 1942 g_journal_mark_as_dirty(sc); 1943 } else { 1944 GJ_DEBUG(0, "Journal %s consistent.", sc->sc_name); 1945 g_journal_copy_start(sc); 1946 } 1947 } 1948 1949 /* 1950 * Wait for requests. 1951 * If we have requests in the current queue, flush them after 3 seconds from the 1952 * last flush. In this way we don't wait forever (or for journal switch) with 1953 * storing not full records on journal. 1954 */ 1955 static void 1956 g_journal_wait(struct g_journal_softc *sc, time_t last_write) 1957 { 1958 int error, timeout; 1959 1960 GJ_DEBUG(3, "%s: enter", __func__); 1961 if (sc->sc_current_count == 0) { 1962 if (g_journal_debug < 2) 1963 msleep(sc, &sc->sc_mtx, PRIBIO | PDROP, "gj:work", 0); 1964 else { 1965 /* 1966 * If we have debug turned on, show number of elements 1967 * in various queues. 1968 */ 1969 for (;;) { 1970 error = msleep(sc, &sc->sc_mtx, PRIBIO, 1971 "gj:work", hz * 3); 1972 if (error == 0) { 1973 mtx_unlock(&sc->sc_mtx); 1974 break; 1975 } 1976 GJ_DEBUG(3, "Report: current count=%d", 1977 sc->sc_current_count); 1978 GJ_DEBUG(3, "Report: flush count=%d", 1979 sc->sc_flush_count); 1980 GJ_DEBUG(3, "Report: flush in progress=%d", 1981 sc->sc_flush_in_progress); 1982 GJ_DEBUG(3, "Report: copy in progress=%d", 1983 sc->sc_copy_in_progress); 1984 GJ_DEBUG(3, "Report: delayed=%d", 1985 sc->sc_delayed_count); 1986 } 1987 } 1988 GJ_DEBUG(3, "%s: exit 1", __func__); 1989 return; 1990 } 1991 1992 /* 1993 * Flush even not full records every 3 seconds. 1994 */ 1995 timeout = (last_write + 3 - time_second) * hz; 1996 if (timeout <= 0) { 1997 mtx_unlock(&sc->sc_mtx); 1998 g_journal_flush(sc); 1999 g_journal_flush_send(sc); 2000 GJ_DEBUG(3, "%s: exit 2", __func__); 2001 return; 2002 } 2003 error = msleep(sc, &sc->sc_mtx, PRIBIO | PDROP, "gj:work", timeout); 2004 if (error == EWOULDBLOCK) 2005 g_journal_flush_send(sc); 2006 GJ_DEBUG(3, "%s: exit 3", __func__); 2007 } 2008 2009 /* 2010 * Worker thread. 2011 */ 2012 static void 2013 g_journal_worker(void *arg) 2014 { 2015 struct g_journal_softc *sc; 2016 struct g_geom *gp; 2017 struct g_provider *pp; 2018 struct bio *bp; 2019 time_t last_write; 2020 int type; 2021 2022 thread_lock(curthread); 2023 sched_prio(curthread, PRIBIO); 2024 thread_unlock(curthread); 2025 2026 sc = arg; 2027 type = 0; /* gcc */ 2028 2029 if (sc->sc_flags & GJF_DEVICE_CLEAN) { 2030 GJ_DEBUG(0, "Journal %s clean.", sc->sc_name); 2031 g_journal_initialize(sc); 2032 } else { 2033 g_journal_sync(sc); 2034 } 2035 /* 2036 * Check if we can use BIO_FLUSH. 2037 */ 2038 sc->sc_bio_flush = 0; 2039 if (g_io_flush(sc->sc_jconsumer) == 0) { 2040 sc->sc_bio_flush |= GJ_FLUSH_JOURNAL; 2041 GJ_DEBUG(1, "BIO_FLUSH supported by %s.", 2042 sc->sc_jconsumer->provider->name); 2043 } else { 2044 GJ_DEBUG(0, "BIO_FLUSH not supported by %s.", 2045 sc->sc_jconsumer->provider->name); 2046 } 2047 if (sc->sc_jconsumer != sc->sc_dconsumer) { 2048 if (g_io_flush(sc->sc_dconsumer) == 0) { 2049 sc->sc_bio_flush |= GJ_FLUSH_DATA; 2050 GJ_DEBUG(1, "BIO_FLUSH supported by %s.", 2051 sc->sc_dconsumer->provider->name); 2052 } else { 2053 GJ_DEBUG(0, "BIO_FLUSH not supported by %s.", 2054 sc->sc_dconsumer->provider->name); 2055 } 2056 } 2057 2058 gp = sc->sc_geom; 2059 g_topology_lock(); 2060 pp = g_new_providerf(gp, "%s.journal", sc->sc_name); 2061 pp->mediasize = sc->sc_mediasize; 2062 /* 2063 * There could be a problem when data provider and journal providers 2064 * have different sectorsize, but such scenario is prevented on journal 2065 * creation. 2066 */ 2067 pp->sectorsize = sc->sc_sectorsize; 2068 g_error_provider(pp, 0); 2069 g_topology_unlock(); 2070 last_write = time_second; 2071 2072 if (sc->sc_rootmount != NULL) { 2073 GJ_DEBUG(1, "root_mount_rel %p", sc->sc_rootmount); 2074 root_mount_rel(sc->sc_rootmount); 2075 sc->sc_rootmount = NULL; 2076 } 2077 2078 for (;;) { 2079 /* Get first request from the queue. */ 2080 mtx_lock(&sc->sc_mtx); 2081 bp = bioq_first(&sc->sc_back_queue); 2082 if (bp != NULL) 2083 type = (bp->bio_cflags & GJ_BIO_MASK); 2084 if (bp == NULL) { 2085 bp = bioq_first(&sc->sc_regular_queue); 2086 if (bp != NULL) 2087 type = GJ_BIO_REGULAR; 2088 } 2089 if (bp == NULL) { 2090 try_switch: 2091 if ((sc->sc_flags & GJF_DEVICE_SWITCH) || 2092 (sc->sc_flags & GJF_DEVICE_DESTROY)) { 2093 if (sc->sc_current_count > 0) { 2094 mtx_unlock(&sc->sc_mtx); 2095 g_journal_flush(sc); 2096 g_journal_flush_send(sc); 2097 continue; 2098 } 2099 if (sc->sc_flush_in_progress > 0) 2100 goto sleep; 2101 if (sc->sc_copy_in_progress > 0) 2102 goto sleep; 2103 } 2104 if (sc->sc_flags & GJF_DEVICE_SWITCH) { 2105 mtx_unlock(&sc->sc_mtx); 2106 g_journal_switch(sc); 2107 wakeup(&sc->sc_journal_copying); 2108 continue; 2109 } 2110 if (sc->sc_flags & GJF_DEVICE_DESTROY) { 2111 GJ_DEBUG(1, "Shutting down worker " 2112 "thread for %s.", gp->name); 2113 sc->sc_worker = NULL; 2114 wakeup(&sc->sc_worker); 2115 mtx_unlock(&sc->sc_mtx); 2116 kproc_exit(0); 2117 } 2118 sleep: 2119 g_journal_wait(sc, last_write); 2120 continue; 2121 } 2122 /* 2123 * If we're in switch process, we need to delay all new 2124 * write requests until its done. 2125 */ 2126 if ((sc->sc_flags & GJF_DEVICE_SWITCH) && 2127 type == GJ_BIO_REGULAR && bp->bio_cmd == BIO_WRITE) { 2128 GJ_LOGREQ(2, bp, "WRITE on SWITCH"); 2129 goto try_switch; 2130 } 2131 if (type == GJ_BIO_REGULAR) 2132 bioq_remove(&sc->sc_regular_queue, bp); 2133 else 2134 bioq_remove(&sc->sc_back_queue, bp); 2135 mtx_unlock(&sc->sc_mtx); 2136 switch (type) { 2137 case GJ_BIO_REGULAR: 2138 /* Regular request. */ 2139 switch (bp->bio_cmd) { 2140 case BIO_READ: 2141 g_journal_read(sc, bp, bp->bio_offset, 2142 bp->bio_offset + bp->bio_length); 2143 break; 2144 case BIO_WRITE: 2145 last_write = time_second; 2146 g_journal_add_request(sc, bp); 2147 g_journal_flush_send(sc); 2148 break; 2149 default: 2150 panic("Invalid bio_cmd (%d).", bp->bio_cmd); 2151 } 2152 break; 2153 case GJ_BIO_COPY: 2154 switch (bp->bio_cmd) { 2155 case BIO_READ: 2156 if (g_journal_copy_read_done(bp)) 2157 g_journal_copy_send(sc); 2158 break; 2159 case BIO_WRITE: 2160 g_journal_copy_write_done(bp); 2161 g_journal_copy_send(sc); 2162 break; 2163 default: 2164 panic("Invalid bio_cmd (%d).", bp->bio_cmd); 2165 } 2166 break; 2167 case GJ_BIO_JOURNAL: 2168 g_journal_flush_done(bp); 2169 g_journal_flush_send(sc); 2170 break; 2171 case GJ_BIO_READ: 2172 default: 2173 panic("Invalid bio (%d).", type); 2174 } 2175 } 2176 } 2177 2178 static void 2179 g_journal_destroy_event(void *arg, int flags __unused) 2180 { 2181 struct g_journal_softc *sc; 2182 2183 g_topology_assert(); 2184 sc = arg; 2185 g_journal_destroy(sc); 2186 } 2187 2188 static void 2189 g_journal_timeout(void *arg) 2190 { 2191 struct g_journal_softc *sc; 2192 2193 sc = arg; 2194 GJ_DEBUG(0, "Timeout. Journal %s cannot be completed.", 2195 sc->sc_geom->name); 2196 g_post_event(g_journal_destroy_event, sc, M_NOWAIT, NULL); 2197 } 2198 2199 static struct g_geom * 2200 g_journal_create(struct g_class *mp, struct g_provider *pp, 2201 const struct g_journal_metadata *md) 2202 { 2203 struct g_journal_softc *sc; 2204 struct g_geom *gp; 2205 struct g_consumer *cp; 2206 int error; 2207 2208 sc = NULL; /* gcc */ 2209 2210 g_topology_assert(); 2211 /* 2212 * There are two possibilities: 2213 * 1. Data and both journals are on the same provider. 2214 * 2. Data and journals are all on separated providers. 2215 */ 2216 /* Look for journal device with the same ID. */ 2217 LIST_FOREACH(gp, &mp->geom, geom) { 2218 sc = gp->softc; 2219 if (sc == NULL) 2220 continue; 2221 if (sc->sc_id == md->md_id) 2222 break; 2223 } 2224 if (gp == NULL) 2225 sc = NULL; 2226 else if (sc != NULL && (sc->sc_type & md->md_type) != 0) { 2227 GJ_DEBUG(1, "Journal device %u already configured.", sc->sc_id); 2228 return (NULL); 2229 } 2230 if (md->md_type == 0 || (md->md_type & ~GJ_TYPE_COMPLETE) != 0) { 2231 GJ_DEBUG(0, "Invalid type on %s.", pp->name); 2232 return (NULL); 2233 } 2234 if (md->md_type & GJ_TYPE_DATA) { 2235 GJ_DEBUG(0, "Journal %u: %s contains data.", md->md_id, 2236 pp->name); 2237 } 2238 if (md->md_type & GJ_TYPE_JOURNAL) { 2239 GJ_DEBUG(0, "Journal %u: %s contains journal.", md->md_id, 2240 pp->name); 2241 } 2242 2243 if (sc == NULL) { 2244 /* Action geom. */ 2245 sc = malloc(sizeof(*sc), M_JOURNAL, M_WAITOK | M_ZERO); 2246 sc->sc_id = md->md_id; 2247 sc->sc_type = 0; 2248 sc->sc_flags = 0; 2249 sc->sc_worker = NULL; 2250 2251 gp = g_new_geomf(mp, "gjournal %u", sc->sc_id); 2252 gp->start = g_journal_start; 2253 gp->orphan = g_journal_orphan; 2254 gp->access = g_journal_access; 2255 gp->softc = sc; 2256 gp->flags |= G_GEOM_VOLATILE_BIO; 2257 sc->sc_geom = gp; 2258 2259 mtx_init(&sc->sc_mtx, "gjournal", NULL, MTX_DEF); 2260 2261 bioq_init(&sc->sc_back_queue); 2262 bioq_init(&sc->sc_regular_queue); 2263 bioq_init(&sc->sc_delayed_queue); 2264 sc->sc_delayed_count = 0; 2265 sc->sc_current_queue = NULL; 2266 sc->sc_current_count = 0; 2267 sc->sc_flush_queue = NULL; 2268 sc->sc_flush_count = 0; 2269 sc->sc_flush_in_progress = 0; 2270 sc->sc_copy_queue = NULL; 2271 sc->sc_copy_in_progress = 0; 2272 sc->sc_inactive.jj_queue = NULL; 2273 sc->sc_active.jj_queue = NULL; 2274 2275 sc->sc_rootmount = root_mount_hold("GJOURNAL"); 2276 GJ_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount); 2277 2278 callout_init(&sc->sc_callout, 1); 2279 if (md->md_type != GJ_TYPE_COMPLETE) { 2280 /* 2281 * Journal and data are on separate providers. 2282 * At this point we have only one of them. 2283 * We setup a timeout in case the other part will not 2284 * appear, so we won't wait forever. 2285 */ 2286 callout_reset(&sc->sc_callout, 5 * hz, 2287 g_journal_timeout, sc); 2288 } 2289 } 2290 2291 /* Remember type of the data provider. */ 2292 if (md->md_type & GJ_TYPE_DATA) 2293 sc->sc_orig_type = md->md_type; 2294 sc->sc_type |= md->md_type; 2295 cp = NULL; 2296 2297 if (md->md_type & GJ_TYPE_DATA) { 2298 if (md->md_flags & GJ_FLAG_CLEAN) 2299 sc->sc_flags |= GJF_DEVICE_CLEAN; 2300 if (md->md_flags & GJ_FLAG_CHECKSUM) 2301 sc->sc_flags |= GJF_DEVICE_CHECKSUM; 2302 cp = g_new_consumer(gp); 2303 error = g_attach(cp, pp); 2304 KASSERT(error == 0, ("Cannot attach to %s (error=%d).", 2305 pp->name, error)); 2306 error = g_access(cp, 1, 1, 1); 2307 if (error != 0) { 2308 GJ_DEBUG(0, "Cannot access %s (error=%d).", pp->name, 2309 error); 2310 g_journal_destroy(sc); 2311 return (NULL); 2312 } 2313 sc->sc_dconsumer = cp; 2314 sc->sc_mediasize = pp->mediasize - pp->sectorsize; 2315 sc->sc_sectorsize = pp->sectorsize; 2316 sc->sc_jstart = md->md_jstart; 2317 sc->sc_jend = md->md_jend; 2318 if (md->md_provider[0] != '\0') 2319 sc->sc_flags |= GJF_DEVICE_HARDCODED; 2320 sc->sc_journal_offset = md->md_joffset; 2321 sc->sc_journal_id = md->md_jid; 2322 sc->sc_journal_previous_id = md->md_jid; 2323 } 2324 if (md->md_type & GJ_TYPE_JOURNAL) { 2325 if (cp == NULL) { 2326 cp = g_new_consumer(gp); 2327 error = g_attach(cp, pp); 2328 KASSERT(error == 0, ("Cannot attach to %s (error=%d).", 2329 pp->name, error)); 2330 error = g_access(cp, 1, 1, 1); 2331 if (error != 0) { 2332 GJ_DEBUG(0, "Cannot access %s (error=%d).", 2333 pp->name, error); 2334 g_journal_destroy(sc); 2335 return (NULL); 2336 } 2337 } else { 2338 /* 2339 * Journal is on the same provider as data, which means 2340 * that data provider ends where journal starts. 2341 */ 2342 sc->sc_mediasize = md->md_jstart; 2343 } 2344 sc->sc_jconsumer = cp; 2345 } 2346 2347 /* Start switcher kproc if needed. */ 2348 if (g_journal_switcher_proc == NULL) 2349 g_journal_start_switcher(mp); 2350 2351 if ((sc->sc_type & GJ_TYPE_COMPLETE) != GJ_TYPE_COMPLETE) { 2352 /* Journal is not complete yet. */ 2353 return (gp); 2354 } else { 2355 /* Journal complete, cancel timeout. */ 2356 callout_drain(&sc->sc_callout); 2357 } 2358 2359 error = kproc_create(g_journal_worker, sc, &sc->sc_worker, 0, 0, 2360 "g_journal %s", sc->sc_name); 2361 if (error != 0) { 2362 GJ_DEBUG(0, "Cannot create worker thread for %s.journal.", 2363 sc->sc_name); 2364 g_journal_destroy(sc); 2365 return (NULL); 2366 } 2367 2368 return (gp); 2369 } 2370 2371 static void 2372 g_journal_destroy_consumer(void *arg, int flags __unused) 2373 { 2374 struct g_consumer *cp; 2375 2376 g_topology_assert(); 2377 cp = arg; 2378 g_detach(cp); 2379 g_destroy_consumer(cp); 2380 } 2381 2382 static int 2383 g_journal_destroy(struct g_journal_softc *sc) 2384 { 2385 struct g_geom *gp; 2386 struct g_provider *pp; 2387 struct g_consumer *cp; 2388 2389 g_topology_assert(); 2390 2391 if (sc == NULL) 2392 return (ENXIO); 2393 2394 gp = sc->sc_geom; 2395 pp = LIST_FIRST(&gp->provider); 2396 if (pp != NULL) { 2397 if (pp->acr != 0 || pp->acw != 0 || pp->ace != 0) { 2398 GJ_DEBUG(1, "Device %s is still open (r%dw%de%d).", 2399 pp->name, pp->acr, pp->acw, pp->ace); 2400 return (EBUSY); 2401 } 2402 g_error_provider(pp, ENXIO); 2403 2404 g_journal_flush(sc); 2405 g_journal_flush_send(sc); 2406 g_journal_switch(sc); 2407 } 2408 2409 sc->sc_flags |= (GJF_DEVICE_DESTROY | GJF_DEVICE_CLEAN); 2410 2411 g_topology_unlock(); 2412 2413 if (sc->sc_rootmount != NULL) { 2414 GJ_DEBUG(1, "root_mount_rel %p", sc->sc_rootmount); 2415 root_mount_rel(sc->sc_rootmount); 2416 sc->sc_rootmount = NULL; 2417 } 2418 2419 callout_drain(&sc->sc_callout); 2420 mtx_lock(&sc->sc_mtx); 2421 wakeup(sc); 2422 while (sc->sc_worker != NULL) 2423 msleep(&sc->sc_worker, &sc->sc_mtx, PRIBIO, "gj:destroy", 0); 2424 mtx_unlock(&sc->sc_mtx); 2425 2426 if (pp != NULL) { 2427 GJ_DEBUG(1, "Marking %s as clean.", sc->sc_name); 2428 g_journal_metadata_update(sc); 2429 g_topology_lock(); 2430 g_wither_provider(pp, ENXIO); 2431 } else { 2432 g_topology_lock(); 2433 } 2434 mtx_destroy(&sc->sc_mtx); 2435 2436 if (sc->sc_current_count != 0) { 2437 GJ_DEBUG(0, "Warning! Number of current requests %d.", 2438 sc->sc_current_count); 2439 } 2440 2441 gp->softc = NULL; 2442 LIST_FOREACH(cp, &gp->consumer, consumer) { 2443 if (cp->acr + cp->acw + cp->ace > 0) 2444 g_access(cp, -1, -1, -1); 2445 /* 2446 * We keep all consumers open for writing, so if I'll detach 2447 * and destroy consumer here, I'll get providers for taste, so 2448 * journal will be started again. 2449 * Sending an event here, prevents this from happening. 2450 */ 2451 g_post_event(g_journal_destroy_consumer, cp, M_WAITOK, NULL); 2452 } 2453 g_wither_geom(gp, ENXIO); 2454 free(sc, M_JOURNAL); 2455 return (0); 2456 } 2457 2458 static void 2459 g_journal_taste_orphan(struct g_consumer *cp) 2460 { 2461 2462 KASSERT(1 == 0, ("%s called while tasting %s.", __func__, 2463 cp->provider->name)); 2464 } 2465 2466 static struct g_geom * 2467 g_journal_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 2468 { 2469 struct g_journal_metadata md; 2470 struct g_consumer *cp; 2471 struct g_geom *gp; 2472 int error; 2473 2474 g_topology_assert(); 2475 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 2476 GJ_DEBUG(2, "Tasting %s.", pp->name); 2477 if (pp->geom->class == mp) 2478 return (NULL); 2479 2480 gp = g_new_geomf(mp, "journal:taste"); 2481 /* This orphan function should be never called. */ 2482 gp->orphan = g_journal_taste_orphan; 2483 cp = g_new_consumer(gp); 2484 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 2485 error = g_attach(cp, pp); 2486 if (error == 0) { 2487 error = g_journal_metadata_read(cp, &md); 2488 g_detach(cp); 2489 } 2490 g_destroy_consumer(cp); 2491 g_destroy_geom(gp); 2492 if (error != 0) 2493 return (NULL); 2494 gp = NULL; 2495 2496 if (md.md_provider[0] != '\0' && 2497 !g_compare_names(md.md_provider, pp->name)) 2498 return (NULL); 2499 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize) 2500 return (NULL); 2501 if (g_journal_debug >= 2) 2502 journal_metadata_dump(&md); 2503 2504 gp = g_journal_create(mp, pp, &md); 2505 return (gp); 2506 } 2507 2508 static struct g_journal_softc * 2509 g_journal_find_device(struct g_class *mp, const char *name) 2510 { 2511 struct g_journal_softc *sc; 2512 struct g_geom *gp; 2513 struct g_provider *pp; 2514 2515 if (strncmp(name, _PATH_DEV, 5) == 0) 2516 name += 5; 2517 LIST_FOREACH(gp, &mp->geom, geom) { 2518 sc = gp->softc; 2519 if (sc == NULL) 2520 continue; 2521 if (sc->sc_flags & GJF_DEVICE_DESTROY) 2522 continue; 2523 if ((sc->sc_type & GJ_TYPE_COMPLETE) != GJ_TYPE_COMPLETE) 2524 continue; 2525 pp = LIST_FIRST(&gp->provider); 2526 if (strcmp(sc->sc_name, name) == 0) 2527 return (sc); 2528 if (pp != NULL && strcmp(pp->name, name) == 0) 2529 return (sc); 2530 } 2531 return (NULL); 2532 } 2533 2534 static void 2535 g_journal_ctl_destroy(struct gctl_req *req, struct g_class *mp) 2536 { 2537 struct g_journal_softc *sc; 2538 const char *name; 2539 char param[16]; 2540 int *nargs; 2541 int error, i; 2542 2543 g_topology_assert(); 2544 2545 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 2546 if (nargs == NULL) { 2547 gctl_error(req, "No '%s' argument.", "nargs"); 2548 return; 2549 } 2550 if (*nargs <= 0) { 2551 gctl_error(req, "Missing device(s)."); 2552 return; 2553 } 2554 2555 for (i = 0; i < *nargs; i++) { 2556 snprintf(param, sizeof(param), "arg%d", i); 2557 name = gctl_get_asciiparam(req, param); 2558 if (name == NULL) { 2559 gctl_error(req, "No 'arg%d' argument.", i); 2560 return; 2561 } 2562 sc = g_journal_find_device(mp, name); 2563 if (sc == NULL) { 2564 gctl_error(req, "No such device: %s.", name); 2565 return; 2566 } 2567 error = g_journal_destroy(sc); 2568 if (error != 0) { 2569 gctl_error(req, "Cannot destroy device %s (error=%d).", 2570 LIST_FIRST(&sc->sc_geom->provider)->name, error); 2571 return; 2572 } 2573 } 2574 } 2575 2576 static void 2577 g_journal_ctl_sync(struct gctl_req *req __unused, struct g_class *mp __unused) 2578 { 2579 2580 g_topology_assert(); 2581 g_topology_unlock(); 2582 g_journal_sync_requested++; 2583 wakeup(&g_journal_switcher_state); 2584 while (g_journal_sync_requested > 0) 2585 tsleep(&g_journal_sync_requested, PRIBIO, "j:sreq", hz / 2); 2586 g_topology_lock(); 2587 } 2588 2589 static void 2590 g_journal_config(struct gctl_req *req, struct g_class *mp, const char *verb) 2591 { 2592 uint32_t *version; 2593 2594 g_topology_assert(); 2595 2596 version = gctl_get_paraml(req, "version", sizeof(*version)); 2597 if (version == NULL) { 2598 gctl_error(req, "No '%s' argument.", "version"); 2599 return; 2600 } 2601 if (*version != G_JOURNAL_VERSION) { 2602 gctl_error(req, "Userland and kernel parts are out of sync."); 2603 return; 2604 } 2605 2606 if (strcmp(verb, "destroy") == 0 || strcmp(verb, "stop") == 0) { 2607 g_journal_ctl_destroy(req, mp); 2608 return; 2609 } else if (strcmp(verb, "sync") == 0) { 2610 g_journal_ctl_sync(req, mp); 2611 return; 2612 } 2613 2614 gctl_error(req, "Unknown verb."); 2615 } 2616 2617 static void 2618 g_journal_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 2619 struct g_consumer *cp, struct g_provider *pp) 2620 { 2621 struct g_journal_softc *sc; 2622 2623 g_topology_assert(); 2624 2625 sc = gp->softc; 2626 if (sc == NULL) 2627 return; 2628 if (pp != NULL) { 2629 /* Nothing here. */ 2630 } else if (cp != NULL) { 2631 int first = 1; 2632 2633 sbuf_printf(sb, "%s<Role>", indent); 2634 if (cp == sc->sc_dconsumer) { 2635 sbuf_cat(sb, "Data"); 2636 first = 0; 2637 } 2638 if (cp == sc->sc_jconsumer) { 2639 if (!first) 2640 sbuf_cat(sb, ","); 2641 sbuf_cat(sb, "Journal"); 2642 } 2643 sbuf_cat(sb, "</Role>\n"); 2644 if (cp == sc->sc_jconsumer) { 2645 sbuf_printf(sb, "<Jstart>%jd</Jstart>\n", 2646 (intmax_t)sc->sc_jstart); 2647 sbuf_printf(sb, "<Jend>%jd</Jend>\n", 2648 (intmax_t)sc->sc_jend); 2649 } 2650 } else { 2651 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id); 2652 } 2653 } 2654 2655 static eventhandler_tag g_journal_event_shutdown = NULL; 2656 static eventhandler_tag g_journal_event_lowmem = NULL; 2657 2658 static void 2659 g_journal_shutdown(void *arg, int howto __unused) 2660 { 2661 struct g_class *mp; 2662 struct g_geom *gp, *gp2; 2663 2664 if (KERNEL_PANICKED()) 2665 return; 2666 mp = arg; 2667 g_topology_lock(); 2668 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 2669 if (gp->softc == NULL) 2670 continue; 2671 GJ_DEBUG(0, "Shutting down geom %s.", gp->name); 2672 g_journal_destroy(gp->softc); 2673 } 2674 g_topology_unlock(); 2675 } 2676 2677 /* 2678 * Free cached requests from inactive queue in case of low memory. 2679 * We free GJ_FREE_AT_ONCE elements at once. 2680 */ 2681 #define GJ_FREE_AT_ONCE 4 2682 static void 2683 g_journal_lowmem(void *arg, int howto __unused) 2684 { 2685 struct g_journal_softc *sc; 2686 struct g_class *mp; 2687 struct g_geom *gp; 2688 struct bio *bp; 2689 u_int nfree = GJ_FREE_AT_ONCE; 2690 2691 g_journal_stats_low_mem++; 2692 mp = arg; 2693 g_topology_lock(); 2694 LIST_FOREACH(gp, &mp->geom, geom) { 2695 sc = gp->softc; 2696 if (sc == NULL || (sc->sc_flags & GJF_DEVICE_DESTROY)) 2697 continue; 2698 mtx_lock(&sc->sc_mtx); 2699 for (bp = sc->sc_inactive.jj_queue; nfree > 0 && bp != NULL; 2700 nfree--, bp = bp->bio_next) { 2701 /* 2702 * This is safe to free the bio_data, because: 2703 * 1. If bio_data is NULL it will be read from the 2704 * inactive journal. 2705 * 2. If bp is sent down, it is first removed from the 2706 * inactive queue, so it's impossible to free the 2707 * data from under in-flight bio. 2708 * On the other hand, freeing elements from the active 2709 * queue, is not safe. 2710 */ 2711 if (bp->bio_data != NULL) { 2712 GJ_DEBUG(2, "Freeing data from %s.", 2713 sc->sc_name); 2714 gj_free(bp->bio_data, bp->bio_length); 2715 bp->bio_data = NULL; 2716 } 2717 } 2718 mtx_unlock(&sc->sc_mtx); 2719 if (nfree == 0) 2720 break; 2721 } 2722 g_topology_unlock(); 2723 } 2724 2725 static void g_journal_switcher(void *arg); 2726 2727 static void 2728 g_journal_init(struct g_class *mp) 2729 { 2730 2731 /* Pick a conservative value if provided value sucks. */ 2732 if (g_journal_cache_divisor <= 0 || 2733 (vm_kmem_size / g_journal_cache_divisor == 0)) { 2734 g_journal_cache_divisor = 5; 2735 } 2736 if (g_journal_cache_limit > 0) { 2737 g_journal_cache_limit = vm_kmem_size / g_journal_cache_divisor; 2738 g_journal_cache_low = 2739 (g_journal_cache_limit / 100) * g_journal_cache_switch; 2740 } 2741 g_journal_event_shutdown = EVENTHANDLER_REGISTER(shutdown_post_sync, 2742 g_journal_shutdown, mp, EVENTHANDLER_PRI_FIRST); 2743 if (g_journal_event_shutdown == NULL) 2744 GJ_DEBUG(0, "Warning! Cannot register shutdown event."); 2745 g_journal_event_lowmem = EVENTHANDLER_REGISTER(vm_lowmem, 2746 g_journal_lowmem, mp, EVENTHANDLER_PRI_FIRST); 2747 if (g_journal_event_lowmem == NULL) 2748 GJ_DEBUG(0, "Warning! Cannot register lowmem event."); 2749 } 2750 2751 static void 2752 g_journal_fini(struct g_class *mp) 2753 { 2754 2755 if (g_journal_event_shutdown != NULL) { 2756 EVENTHANDLER_DEREGISTER(shutdown_post_sync, 2757 g_journal_event_shutdown); 2758 } 2759 if (g_journal_event_lowmem != NULL) 2760 EVENTHANDLER_DEREGISTER(vm_lowmem, g_journal_event_lowmem); 2761 if (g_journal_switcher_proc != NULL) 2762 g_journal_stop_switcher(); 2763 } 2764 2765 DECLARE_GEOM_CLASS(g_journal_class, g_journal); 2766 2767 static const struct g_journal_desc * 2768 g_journal_find_desc(const char *fstype) 2769 { 2770 const struct g_journal_desc *desc; 2771 int i; 2772 2773 for (desc = g_journal_filesystems[i = 0]; desc != NULL; 2774 desc = g_journal_filesystems[++i]) { 2775 if (strcmp(desc->jd_fstype, fstype) == 0) 2776 break; 2777 } 2778 return (desc); 2779 } 2780 2781 static void 2782 g_journal_switch_wait(struct g_journal_softc *sc) 2783 { 2784 struct bintime bt; 2785 2786 mtx_assert(&sc->sc_mtx, MA_OWNED); 2787 if (g_journal_debug >= 2) { 2788 if (sc->sc_flush_in_progress > 0) { 2789 GJ_DEBUG(2, "%d requests flushing.", 2790 sc->sc_flush_in_progress); 2791 } 2792 if (sc->sc_copy_in_progress > 0) { 2793 GJ_DEBUG(2, "%d requests copying.", 2794 sc->sc_copy_in_progress); 2795 } 2796 if (sc->sc_flush_count > 0) { 2797 GJ_DEBUG(2, "%d requests to flush.", 2798 sc->sc_flush_count); 2799 } 2800 if (sc->sc_delayed_count > 0) { 2801 GJ_DEBUG(2, "%d requests delayed.", 2802 sc->sc_delayed_count); 2803 } 2804 } 2805 g_journal_stats_switches++; 2806 if (sc->sc_copy_in_progress > 0) 2807 g_journal_stats_wait_for_copy++; 2808 GJ_TIMER_START(1, &bt); 2809 sc->sc_flags &= ~GJF_DEVICE_BEFORE_SWITCH; 2810 sc->sc_flags |= GJF_DEVICE_SWITCH; 2811 wakeup(sc); 2812 while (sc->sc_flags & GJF_DEVICE_SWITCH) { 2813 msleep(&sc->sc_journal_copying, &sc->sc_mtx, PRIBIO, 2814 "gj:switch", 0); 2815 } 2816 GJ_TIMER_STOP(1, &bt, "Switch time of %s", sc->sc_name); 2817 } 2818 2819 static void 2820 g_journal_do_switch(struct g_class *classp) 2821 { 2822 struct g_journal_softc *sc; 2823 const struct g_journal_desc *desc; 2824 struct g_geom *gp; 2825 struct mount *mp; 2826 struct bintime bt; 2827 char *mountpoint; 2828 int error, save; 2829 2830 g_topology_lock(); 2831 LIST_FOREACH(gp, &classp->geom, geom) { 2832 sc = gp->softc; 2833 if (sc == NULL) 2834 continue; 2835 if (sc->sc_flags & GJF_DEVICE_DESTROY) 2836 continue; 2837 if ((sc->sc_type & GJ_TYPE_COMPLETE) != GJ_TYPE_COMPLETE) 2838 continue; 2839 mtx_lock(&sc->sc_mtx); 2840 sc->sc_flags |= GJF_DEVICE_BEFORE_SWITCH; 2841 mtx_unlock(&sc->sc_mtx); 2842 } 2843 g_topology_unlock(); 2844 2845 mtx_lock(&mountlist_mtx); 2846 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 2847 if (mp->mnt_gjprovider == NULL) 2848 continue; 2849 if (mp->mnt_flag & MNT_RDONLY) 2850 continue; 2851 desc = g_journal_find_desc(mp->mnt_stat.f_fstypename); 2852 if (desc == NULL) 2853 continue; 2854 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) 2855 continue; 2856 /* mtx_unlock(&mountlist_mtx) was done inside vfs_busy() */ 2857 2858 g_topology_lock(); 2859 sc = g_journal_find_device(classp, mp->mnt_gjprovider); 2860 g_topology_unlock(); 2861 2862 if (sc == NULL) { 2863 GJ_DEBUG(0, "Cannot find journal geom for %s.", 2864 mp->mnt_gjprovider); 2865 goto next; 2866 } else if (JEMPTY(sc)) { 2867 mtx_lock(&sc->sc_mtx); 2868 sc->sc_flags &= ~GJF_DEVICE_BEFORE_SWITCH; 2869 mtx_unlock(&sc->sc_mtx); 2870 GJ_DEBUG(3, "No need for %s switch.", sc->sc_name); 2871 goto next; 2872 } 2873 2874 mountpoint = mp->mnt_stat.f_mntonname; 2875 2876 error = vn_start_write(NULL, &mp, V_WAIT); 2877 if (error != 0) { 2878 GJ_DEBUG(0, "vn_start_write(%s) failed (error=%d).", 2879 mountpoint, error); 2880 goto next; 2881 } 2882 2883 save = curthread_pflags_set(TDP_SYNCIO); 2884 2885 GJ_TIMER_START(1, &bt); 2886 vfs_periodic(mp, MNT_NOWAIT); 2887 GJ_TIMER_STOP(1, &bt, "Msync time of %s", mountpoint); 2888 2889 GJ_TIMER_START(1, &bt); 2890 error = VFS_SYNC(mp, MNT_NOWAIT); 2891 if (error == 0) 2892 GJ_TIMER_STOP(1, &bt, "Sync time of %s", mountpoint); 2893 else { 2894 GJ_DEBUG(0, "Cannot sync file system %s (error=%d).", 2895 mountpoint, error); 2896 } 2897 2898 curthread_pflags_restore(save); 2899 2900 vn_finished_write(mp); 2901 2902 if (error != 0) 2903 goto next; 2904 2905 /* 2906 * Send BIO_FLUSH before freezing the file system, so it can be 2907 * faster after the freeze. 2908 */ 2909 GJ_TIMER_START(1, &bt); 2910 g_journal_flush_cache(sc); 2911 GJ_TIMER_STOP(1, &bt, "BIO_FLUSH time of %s", sc->sc_name); 2912 2913 GJ_TIMER_START(1, &bt); 2914 error = vfs_write_suspend(mp, VS_SKIP_UNMOUNT); 2915 GJ_TIMER_STOP(1, &bt, "Suspend time of %s", mountpoint); 2916 if (error != 0) { 2917 GJ_DEBUG(0, "Cannot suspend file system %s (error=%d).", 2918 mountpoint, error); 2919 goto next; 2920 } 2921 2922 error = desc->jd_clean(mp); 2923 if (error != 0) 2924 goto next; 2925 2926 mtx_lock(&sc->sc_mtx); 2927 g_journal_switch_wait(sc); 2928 mtx_unlock(&sc->sc_mtx); 2929 2930 vfs_write_resume(mp, 0); 2931 next: 2932 mtx_lock(&mountlist_mtx); 2933 vfs_unbusy(mp); 2934 } 2935 mtx_unlock(&mountlist_mtx); 2936 2937 sc = NULL; 2938 for (;;) { 2939 g_topology_lock(); 2940 LIST_FOREACH(gp, &g_journal_class.geom, geom) { 2941 sc = gp->softc; 2942 if (sc == NULL) 2943 continue; 2944 mtx_lock(&sc->sc_mtx); 2945 if ((sc->sc_type & GJ_TYPE_COMPLETE) == GJ_TYPE_COMPLETE && 2946 !(sc->sc_flags & GJF_DEVICE_DESTROY) && 2947 (sc->sc_flags & GJF_DEVICE_BEFORE_SWITCH)) { 2948 break; 2949 } 2950 mtx_unlock(&sc->sc_mtx); 2951 sc = NULL; 2952 } 2953 g_topology_unlock(); 2954 if (sc == NULL) 2955 break; 2956 mtx_assert(&sc->sc_mtx, MA_OWNED); 2957 g_journal_switch_wait(sc); 2958 mtx_unlock(&sc->sc_mtx); 2959 } 2960 } 2961 2962 static void 2963 g_journal_start_switcher(struct g_class *mp) 2964 { 2965 int error __diagused; 2966 2967 g_topology_assert(); 2968 MPASS(g_journal_switcher_proc == NULL); 2969 g_journal_switcher_state = GJ_SWITCHER_WORKING; 2970 error = kproc_create(g_journal_switcher, mp, &g_journal_switcher_proc, 2971 0, 0, "g_journal switcher"); 2972 KASSERT(error == 0, ("Cannot create switcher thread.")); 2973 } 2974 2975 static void 2976 g_journal_stop_switcher(void) 2977 { 2978 g_topology_assert(); 2979 MPASS(g_journal_switcher_proc != NULL); 2980 g_journal_switcher_state = GJ_SWITCHER_DIE; 2981 wakeup(&g_journal_switcher_state); 2982 while (g_journal_switcher_state != GJ_SWITCHER_DIED) 2983 tsleep(&g_journal_switcher_state, PRIBIO, "jfini:wait", hz / 5); 2984 GJ_DEBUG(1, "Switcher died."); 2985 g_journal_switcher_proc = NULL; 2986 } 2987 2988 /* 2989 * TODO: Kill switcher thread on last geom destruction? 2990 */ 2991 static void 2992 g_journal_switcher(void *arg) 2993 { 2994 struct g_class *mp; 2995 struct bintime bt; 2996 int error; 2997 2998 mp = arg; 2999 curthread->td_pflags |= TDP_NORUNNINGBUF; 3000 for (;;) { 3001 g_journal_switcher_wokenup = 0; 3002 error = tsleep(&g_journal_switcher_state, PRIBIO, "jsw:wait", 3003 g_journal_switch_time * hz); 3004 if (g_journal_switcher_state == GJ_SWITCHER_DIE) { 3005 g_journal_switcher_state = GJ_SWITCHER_DIED; 3006 GJ_DEBUG(1, "Switcher exiting."); 3007 wakeup(&g_journal_switcher_state); 3008 kproc_exit(0); 3009 } 3010 if (error == 0 && g_journal_sync_requested == 0) { 3011 GJ_DEBUG(1, "Out of cache, force switch (used=%jd " 3012 "limit=%jd).", (intmax_t)g_journal_cache_used, 3013 (intmax_t)g_journal_cache_limit); 3014 } 3015 GJ_TIMER_START(1, &bt); 3016 g_journal_do_switch(mp); 3017 GJ_TIMER_STOP(1, &bt, "Entire switch time"); 3018 if (g_journal_sync_requested > 0) { 3019 g_journal_sync_requested = 0; 3020 wakeup(&g_journal_sync_requested); 3021 } 3022 } 3023 }
Cache object: c24be479ed97a5d5f5b66bf5c0bfefaa
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